Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 042e82fd5e2309e3…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 66d050c84ce9652a779bf6adadc5a752 SHA-1: 2dd4d8c3806782fefccbf47192d4f7e318733f1a SHA-256: 042e82fd5e2309e37c4f0ed6bffad8fd356eb0937454331c8d126e87e6fc7b19
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by multiple heuristics and a critical ClamAV detection as Win.Trojan.Agent-36166. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. This is a common technique for delivering malware via email attachments.

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
e305163fe9a0c0c9826c6e7c966ef29bfaa696833a09ec73e05a67ed01641af9		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74405 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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