Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 75df36303c8b0961…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: f6166e16364a7b37b94f5f5762c85581 SHA-1: 837b9eb90b26766516e3586169eccbd2236f16b9 SHA-256: 75df36303c8b0961721e7920972a500e4f7e99af8490d1e8f52728baed331134
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

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

The PDF file contains embedded JavaScript, identified by multiple heuristics and ClamAV detection as Win.Trojan.Agent-36166. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of JavaScript within a PDF strongly suggests it was delivered as a spearphishing attachment.

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
5a2b094bb4d96b04fa6c44a69051db1484e0857aad56066a2dbd198061c437cb		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74385 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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