TROJ_PDFJS.MM
Windows 98, ME, NT, 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It takes advantage of software vulnerabilities in certain software to drop malicious files.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Dropping Routine
This Trojan drops the following files:
- %User Temp%\cltuser32.exe – detected as TROJ_AGENT.ORT
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
It takes advantage of unknown vulnerabilities in the following software to drop malicious files:
- Adobe Vulnerability CVE-2009-4324 - Use-after-free vulnerability in Doc.media.newPlayer method in Adobe Reader and Acrobat 8.0 to 9.2, and possibly earlier versions, which allows remote attackers to execute arbitrary code via a crafted PDF file using ZLib compressed streams
Other Details
For more information on the aforementioned vulnerabilities, please see the following pages:
- http://www.adobe.com/support/security/advisories/apsa09-07.html
SOLUTION
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
Remove malware files dropped/downloaded by TROJ_PDFJS.MM
- TROJ_AGENT.ORT
Step 3
Scan your computer with your Trend Micro product to delete files detected as TROJ_PDFJS.MM. 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.
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