Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f41716cdf7199a6…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 547dacff303c86323eddf50e5e9b3ec2 SHA-1: 153a96e83eb2ca40f21c199b52839f5f2690b0d6 SHA-256: 0f41716cdf7199a6c01fdfea188233c5fb8844e7a23bda6459b9cd7411be4c48
166 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, flagged by multiple heuristics and identified by ClamAV as Win.Trojan.Agent-36166. The JavaScript appears to be heavily obfuscated but is likely responsible for downloading and executing a secondary payload, a common tactic for this type of malware. The presence of JavaScript actions and embedded JS streams strongly suggests malicious intent.

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
3eea65e65f45c8110538a827245191ea81bad543712d7323bd65880f629f2081		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84145 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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