Analysis by: Joseph Obed
ALIASES:

Exploit:Win32/Pdfjsc.RF [Microsoft], Exploit.JS.Pdfka.fna [Kaspersky]

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 14,657 bytes
File Type: PDF
Memory Resident: Yes
Initial Samples Received Date: 16 Feb 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:

After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:

  • http://www.{BLOCKED}pulver-design.de/images/files/prof.exe
  • http://{BLOCKED}dieband.de/2lang/content/content/content.exe
  • http://{BLOCKED}arten-renhardsweiler.de/files/42/upload.exe

Other Details

More information on this vulnerability can be found below:

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.778.02
FIRST VSAPI PATTERN DATE: 16 Feb 2012
VSAPI OPR PATTERN File: 8.779.00
VSAPI OPR PATTERN Date: 17 Feb 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product to delete files detected as TROJ_PDFKA.LEX. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 3

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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