Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 6820f581e9e297a0…

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: 9b5d1eecf4af70076a662572b7c2bed1 SHA-1: 9a02ca0ad17e6e94437b618d50f0603f5a51934a SHA-256: 6820f581e9e297a0deb98f34fa8ff4b28ad0ddd6c6a06e413f07c83eeb2ff1ec
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, identified by heuristics and ClamAV as malicious (Win.Trojan.Agent-36166). The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, supporting the ClamAV detection.

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
7f7086f8bf2243652571ff03a67e383842134e2f59a83e0008efde7cc6bcf525		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74743 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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