Quoted from newest Kaspersky laboratory with topic "Information Security Threats in the First Quarter of 2010", now Adobe products is the main target of hackers. This is because the ability of the prevalence and multi-platform Adobe products. Among the many types of viruses, spyware and malware threats are detected, the family is the most popular Exploit.Win32.Pdfka with the percentage of 42.97 percent. This malware takes advantage of the weak side of Adobe Reader and Adobe Acrobat.
When coupled, Exploit.Win32.Pidief and Exploit.Win32.Pdfka targeting Adobe products with a total of 47.5 percent or about half of all attacks are detected. Detected attacks spread through the PDF document that contains Javascript that without the knowledge or consent from users to download and bring the rest of the malware directly from the internet.
Among the ten vulnerabilities of the most common software detected on users' computers during the first three months of the year 2010, three vulnerabilities found in Adobe products, six are found in Microsoft products, and the one found in Sun product.
All three programs targeting the vulnerabilities that Adobe was found on 23.37 percent, 17.87 percent and 15.27 percent of all computers are checked. The first vulnerability and last critical vulnerability that allows hackers to take complete control over the system remotely.
In addition, Adobe products user are often unaware of the potential threat posed, for example when opening a PDF file from an unknown sender. This report highlights the fact that many users of Adobe products do not install the patch that is designed to remove the software vulnerability and thus remain vulnerable to attacks.
One of the vulnerabilities in Adobe's products became public knowledge since three years ago has had a patch that is available all the time. This shows that there are still many users who do not update their software. To overcome this problem, on 13 April ago, Adobe released an automatic update that runs in the background. Developers are expected to help reduce the number of unpatched applications that look so attractive to cyber criminals.
2010년 12월 10일 금요일
How to print a protected PDF files
Immediately, the topic of the problem is how to print a PDF file of the protection, we can use the software GSView from Ghostgum. GSView is a free software to outsmart the pdf files in the protection, to get it can be downloaded through http://pages.cs.wisc.edu/%7Eghost/gsview/
How to open a PDF file protection that it can not copy-paste:
GSView has other functions that also can convert PDF files that previously had been protected (can not be printed and on-copy-paste) and into a PDF file that is no longer protected. The way it is, we open the first PDF file with GSView, then select the File menu, Convert, and then we select Device "pdfwrite" to generate a new PDF file which of course is not protected.
in order to run software GSView we also need to install Ghostscript program (also freeware:)), can be downloaded http://pages.cs.wisc.edu/%7Eghost/doc/GPL/index.htm
How to open a PDF file protection that it can not copy-paste:
GSView has other functions that also can convert PDF files that previously had been protected (can not be printed and on-copy-paste) and into a PDF file that is no longer protected. The way it is, we open the first PDF file with GSView, then select the File menu, Convert, and then we select Device "pdfwrite" to generate a new PDF file which of course is not protected.
in order to run software GSView we also need to install Ghostscript program (also freeware:)), can be downloaded http://pages.cs.wisc.edu/%7Eghost/doc/GPL/index.htm
Optimizing Adobe Reader
Adobe Reader is already made some modifications so that updates the latest version able to open and navigate the document more hurried than the previous version. Even so, some users of this application rate is still slow, so better choose other similar applications.
Actually there are some simple tricks to optimize the performance of Adobe Reader. Here is a tricks.
1. Remove plug-ins that are not needed.
Before deleting, you should first check the description of each plug-in to avoid mistakes in the elimination. Do not until you remove the plug-in that its essential that the document does not open it at all. To do this, click "Help" in the application window, and select "About Adobe Plug-Ins ...". Information plug-in will immediately show its dependence on other plug-ins. Record if necessary.
Armed with this information you then get into the directory Adobe Reader. Find the folder named plug_ins. Remove all plug-ins that are not needed. For example, if your PC does not have an Internet connection, delete the plug-in such Updater and Sendmail. Previous make back-ups just in case.
2. Streamline the load start-up.
Click "Edit> Preferences ...", then select option "Startup". Uncheck the "Display splash screen" and "Show Messages and automatically update".
3. Lower Resolution.
Still in the Preferences window, click the option "Page Display". Lower resolution value option by clicking the Custom Resolution. Give a lower value than the default value.
4. Hide all toolbars by clicking the "F8" or click the menu "View> Toolbars", and "Hide Toolbars". Instead make use of keyboard shortcut. List of shortcut can be seen in the menu "Help".
Actually there are some simple tricks to optimize the performance of Adobe Reader. Here is a tricks.
1. Remove plug-ins that are not needed.
Before deleting, you should first check the description of each plug-in to avoid mistakes in the elimination. Do not until you remove the plug-in that its essential that the document does not open it at all. To do this, click "Help" in the application window, and select "About Adobe Plug-Ins ...". Information plug-in will immediately show its dependence on other plug-ins. Record if necessary.
Armed with this information you then get into the directory Adobe Reader. Find the folder named plug_ins. Remove all plug-ins that are not needed. For example, if your PC does not have an Internet connection, delete the plug-in such Updater and Sendmail. Previous make back-ups just in case.
2. Streamline the load start-up.
Click "Edit> Preferences ...", then select option "Startup". Uncheck the "Display splash screen" and "Show Messages and automatically update".
3. Lower Resolution.
Still in the Preferences window, click the option "Page Display". Lower resolution value option by clicking the Custom Resolution. Give a lower value than the default value.
4. Hide all toolbars by clicking the "F8" or click the menu "View> Toolbars", and "Hide Toolbars". Instead make use of keyboard shortcut. List of shortcut can be seen in the menu "Help".
Print All PDF Files
Adobe Reader is the application that "resignation". Why is that? Because this application only accept what the setting by making the document. Documents locked his editing features, reader along, protected document printing, readers were adherents. Not to mention other constraints limit such restrictions to add a comment, fill out the form, and so on.
This level of protection as much done by some companies, such as by a book publisher. The goal clearly restrict access to only the reader can read without being able to make a hard copy of the document.
What if we really need to print a protected document that? That's the trouble. Let us see to it that this document can be printed.
To facilitate this discussion, will be presented in advance how to create a pdf file with high protection level (128-bit RC4). Run your software maker pdf respectively. Create an example we use OpenOffice.org as a pdf creator software, and for those who use other than OOo please adjust the steps to make appropriate encryption software pdf document your maker.
After a document created in OOo, click the menu "File"> "Export as PDF ..." or by using the menu button click "Export Directly as PDF" which is on the main toolbar. Later in the Export dialog box, please select the directory where to save a PDF document and the name of the file. Click the "Export ...".
The next window will pop up a PDF Options for setting attributes (properties) document. Aktiflah on "Security" tab. Give a check in the permissions restrict choice. After that, click the "Set password ...". permissions In the Permission Set Password window, enter your password in the Password field line and repeat the Confirm field line. Click "OK".
Printing settings, please select Not permitted to not allow to print the document. Changes to the settings, please select Not permitted to not allow any form of change, including the play page, fill out a form, providing comments and extract pages. Remove the check mark next to the option Enable copying of content to not allow copying of selected text. Remove also the option Enable text access for accessibility tools. Click the "Export" to start the process of creating documents in PDF format.
Once completed, please run your Acrobat Reader software. Open the document that was created earlier. Once opened try to look at the far left end of the status bar. You will see a picture of a padlock icon is yellow, a sign that you are protected PDF document.
Try also to access the File menu. Be found to the menu "Print ..." is off (disable). As is the case when pressing the key combination "Ctrl" + "P" will not give any reaction. Next try to access "Select Tool" on the basic toolbar. Seleksilah few pieces of words or sentences, then right click on it. The author only see the menu option "Select All" and "Deselect All", and found no copy of the menu. Try to access the menu "File"> "Document Properties ..." or with a combination of keys "Ctrl" + "D".
In the Document Properties window go to the Security tab and then click the "Show Details ...". Next will be shown a summary of the security of PDF documents created earlier, ranging from security methods, the use of passwords, the things that are permitted and which are not permitted and the level of encryption do.
In order for Adobe Reader can print, use Linux. Here we will use the example of SimplyMEPIS Linux 6.5 distribution that includes extras packages Ubuntu "Feisty Fawn" 7:04.
Make sure you already have a package called poppler-utils. If not, do a good installation with compiling from tarball file or by using a binary package built your distro. For users of Debian (including Ubuntu) and its derivatives, use a command line with root access.
# Apt-get install poppler-utils
Next go to the directory where the PDF file is located. Directory used in this article is $ HOME / Documents. To view information about a PDF document, use the command pdfinfo. Command given pattern is
$ Pdfinfo "options"
Will be shown information relating to the file, including whether the document is encrypted and different treatment is allowed for the document. To convert PDF documents into text format, use the command with the pattern pdftotext
$ Pdftotext "options" ""
To convert PDF to postscript format, use the command with the pattern pdf2ps
$ pdf2ps "-dASCII85EncodePages = false" "-dLanguageLevel = 1 | 2 | 3" input.pdf "output.ps"
To extract the image that is on the document, use the command pdfimages, with patterns
$ Pdfimages "options"
Here seen that the document is encrypted with various restrictions on it can be converted to text, although previously not be copied by selecting the text from Acrobat Reader.
To perform printing, which required only kghostview applications. Kghostview is true for reading postscript documents, but other than ps file pdf format can be read by the application of this one. What if the documents 'teramankan' were opened in addition to using kghostview, such as Kpdf or Xpdf? Kpdf not provide access to print documents.
Doing the printing of documents via kghostview, as well as other applications, simply by accessing the menu "File"> "Print ..." or the shortcut "Ctrl" + "P". It will not appear warning that protected PDF documents and PDF documents, etc. and it would be printed on paper. Ordering printing can be done, such as a printer selection to be used, setting the paper size, print quality, the page will be printed and so on.
For information, PDF versions used in this tutorial is 1.4 (OOo generates results).
This level of protection as much done by some companies, such as by a book publisher. The goal clearly restrict access to only the reader can read without being able to make a hard copy of the document.
What if we really need to print a protected document that? That's the trouble. Let us see to it that this document can be printed.
To facilitate this discussion, will be presented in advance how to create a pdf file with high protection level (128-bit RC4). Run your software maker pdf respectively. Create an example we use OpenOffice.org as a pdf creator software, and for those who use other than OOo please adjust the steps to make appropriate encryption software pdf document your maker.
After a document created in OOo, click the menu "File"> "Export as PDF ..." or by using the menu button click "Export Directly as PDF" which is on the main toolbar. Later in the Export dialog box, please select the directory where to save a PDF document and the name of the file. Click the "Export ...".
The next window will pop up a PDF Options for setting attributes (properties) document. Aktiflah on "Security" tab. Give a check in the permissions restrict choice. After that, click the "Set password ...". permissions In the Permission Set Password window, enter your password in the Password field line and repeat the Confirm field line. Click "OK".
Printing settings, please select Not permitted to not allow to print the document. Changes to the settings, please select Not permitted to not allow any form of change, including the play page, fill out a form, providing comments and extract pages. Remove the check mark next to the option Enable copying of content to not allow copying of selected text. Remove also the option Enable text access for accessibility tools. Click the "Export" to start the process of creating documents in PDF format.
Once completed, please run your Acrobat Reader software. Open the document that was created earlier. Once opened try to look at the far left end of the status bar. You will see a picture of a padlock icon is yellow, a sign that you are protected PDF document.
Try also to access the File menu. Be found to the menu "Print ..." is off (disable). As is the case when pressing the key combination "Ctrl" + "P" will not give any reaction. Next try to access "Select Tool" on the basic toolbar. Seleksilah few pieces of words or sentences, then right click on it. The author only see the menu option "Select All" and "Deselect All", and found no copy of the menu. Try to access the menu "File"> "Document Properties ..." or with a combination of keys "Ctrl" + "D".
In the Document Properties window go to the Security tab and then click the "Show Details ...". Next will be shown a summary of the security of PDF documents created earlier, ranging from security methods, the use of passwords, the things that are permitted and which are not permitted and the level of encryption do.
In order for Adobe Reader can print, use Linux. Here we will use the example of SimplyMEPIS Linux 6.5 distribution that includes extras packages Ubuntu "Feisty Fawn" 7:04.
Make sure you already have a package called poppler-utils. If not, do a good installation with compiling from tarball file or by using a binary package built your distro. For users of Debian (including Ubuntu) and its derivatives, use a command line with root access.
# Apt-get install poppler-utils
Next go to the directory where the PDF file is located. Directory used in this article is $ HOME / Documents. To view information about a PDF document, use the command pdfinfo. Command given pattern is
$ Pdfinfo "options"
Will be shown information relating to the file, including whether the document is encrypted and different treatment is allowed for the document. To convert PDF documents into text format, use the command with the pattern pdftotext
$ Pdftotext "options"
To convert PDF to postscript format, use the command with the pattern pdf2ps
$ pdf2ps "-dASCII85EncodePages = false" "-dLanguageLevel = 1 | 2 | 3" input.pdf "output.ps"
To extract the image that is on the document, use the command pdfimages, with patterns
$ Pdfimages "options"
Here seen that the document is encrypted with various restrictions on it can be converted to text, although previously not be copied by selecting the text from Acrobat Reader.
To perform printing, which required only kghostview applications. Kghostview is true for reading postscript documents, but other than ps file pdf format can be read by the application of this one. What if the documents 'teramankan' were opened in addition to using kghostview, such as Kpdf or Xpdf? Kpdf not provide access to print documents.
Doing the printing of documents via kghostview, as well as other applications, simply by accessing the menu "File"> "Print ..." or the shortcut "Ctrl" + "P". It will not appear warning that protected PDF documents and PDF documents, etc. and it would be printed on paper. Ordering printing can be done, such as a printer selection to be used, setting the paper size, print quality, the page will be printed and so on.
For information, PDF versions used in this tutorial is 1.4 (OOo generates results).
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