Malicious PDF — malware analysis report

Static analysis result for SHA-256 a067f61057be37c7…

MALICIOUS

PDF

14.8 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: f283340c6608bd6f406b78c2bc45f427 SHA-1: cd378c912f8a19d3e09f7864154a7b353cd6d227 SHA-256: a067f61057be37c7a1c4bc4ed619e56b56e8b890a5c009fd7e14ca0cdd70fa0c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, suggests an attempt to execute malicious code. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be the exploitation of PDF vulnerabilities via embedded scripts.

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
819a95922fcbfa6c603808206a9b26ba92c2eaf552493de68955070138dd4bce		 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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