Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 089d42e14862286b…

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: d09b9a46d6551e6afe92b40f6a2d9745 SHA-1: 3320594dc17e9269ac03130a90705208b2f56ace SHA-256: 089d42e14862286b1d20ec22e1bee1774ea280dd683259981c942c878997a0b7
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded JavaScript which is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection name 'Win.Trojan.Agent-36166' strongly suggests the nature of the malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36166
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
4704a4eb358422d512de7cb217107d9d7582f7de6d0d1923b2fe8c10f053fb6a		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74298 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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