Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c34cc8f2c22617…

MALICIOUS

PDF

14.7 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 0766f53a2020c05e83f89116cfc29367 SHA-1: 802e62033170b89dc26f080410c3daca366615af SHA-256: 63c34cc8f2c22617c865d2373c1d69b13a52c19e3c7a712f554d9084ae6f0f65
166 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, identified by multiple heuristics and a critical ClamAV detection as Win.Trojan.Agent-36166. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload, a common technique for malware delivery. 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
605f54ec58b1f8a639940e9724a74d42ff494b89fd043b9ab9179ba0ce1b5eb8		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 76595 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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