Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9623570b045a6fd…

MALICIOUS

PDF

17.2 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: dbe859e821b986f9588b935f2b95b182 SHA-1: 0e23675b030ccf4ab4ec28d4392f0142468e64c6 SHA-256: b9623570b045a6fdff7cfb84fef540f6fe32a1cb7ae21d2e259f0c56900e717e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including critical ClamAV detections for 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS firings, suggests an attempt to execute malicious code. This JavaScript is likely responsible for downloading and executing a second-stage payload, aligning with the identified malware family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
32fc910d32da4a365b2642a4af6a740e3fffbdd659a2ee56ca0faf1646cd08a9		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 89772 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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