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Virus Profile: Exploit-PDF.px

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 6/28/2012
Date Added: 6/28/2012
Origin: N/A
Length: Varies
Type: Trojan
Subtype: Generic
DAT Required: 6235
Removal Instructions
   
 
 
   

Description

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Indication of Infection

Because this is a generic detection there is no specific description of the activity undertaken by JavaScript detected under this name, however these can include malicious activity such as downloading and executing files or scripts.

Methods of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, email spam, etc.
   

Virus Characteristics

Aliases

  • Kaspersky -  Exploit.JS.Pdfka.fvj
  • NOD32 - JS/Exploit.Pdfka.PLM
  • Sophos - Troj/PdfJs-XW
  • Microsoft- Exploit:Win32/Pdfjsc.ABS

“Exploit-PDF.px” is the detection for specially designed PDF files that attempt to exploit software vulnerabilities in Adobe Acrobat and Adobe Reader.

These PDF files contain an obfuscated JavaScript, when loaded (as when the files are opened in a vulnerable version of Adobe Acrobat or Adobe Reader) .The embedded JavaScript may contain malicious instructions, such as commands to download and install other malware from malicious site.

Some of the vulnerabilities that various “Exploit-PDF.px” samples have been known to exploit are

CVE-2009-0927

And It creates the following files in the below location

  • %Temp%\AcrF9B2.tmp
  • %Temp%\AcrF9B3.tmp
  • %Temp%\AcrF9B4.tmp

The below folders has been created to the system

  • %AppData%\Adobe\Linguistics\Dictionaries\Adobe Custom Dictionary
  • %AppData%\Adobe\Linguistics\Dictionaries\Adobe Custom Dictionary\all

The following registry keys has been created

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DownloadManager

The following registry values has been modified to the system

  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{618736E0-3C3D-11CF-810C-00AA00389B71}\TypeLib\Version: "3.0"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{618736E0-3C3D-11CF-810C-00AA00389B71}\TypeLib\Version: "1.1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{618736E0-3C3D-11CF-810C-00AA00389B71}\TypeLib\: "{C523F390-9C83-11D3-9094-00104BD0D535}"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{618736E0-3C3D-11CF-810C-00AA00389B71}\TypeLib\: "{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}"
  • HKEY_USER\S-1-[varies]\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings: 3C 00 00 00 28 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 80 7E 39 29 A0 31 C6 01 01 00 00 00 C0 A8 C7 96 00 00 00 00 00 00 00 00
   

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.