Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 343ebd88037c79e9…

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: 4e1563c33732dbd724d9f70a857b2af1 SHA-1: 07d195f5b4d7e27036c77048ac424a3b07a586d6 SHA-256: 343ebd88037c79e94c473e31a42a1ae01c5cad53faf79823641d2c0729431c55
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a critical ClamAV detection for Win.Trojan.Agent-36166. The JavaScript is heavily obfuscated, but its presence and the ML classifier's high confidence indicate malicious intent, likely to download and execute a secondary payload. The ClamAV detection provides a specific family name.

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
d0c0c47898c553e6e2345ea85203481810f07a3166a774042e3a591b88a63d1a		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74811 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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