Malicious PDF — malware analysis report

Static analysis result for SHA-256 5671825964134f78…

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: cb9f118e0e0d5a81897afa7bbdd80df2 SHA-1: c706b7a811937d4b2b71392ab945cdcbbc2014b6 SHA-256: 5671825964134f787cd8e4abbffdf1f31ce4a9ef7bc46ca47a3836e3fcb8206f
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically identifying it as a dropper agent. The presence of embedded JavaScript, indicated by 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, strongly suggests that the script is responsible for downloading and executing a secondary payload. The ClamAV detections 'Pdf.Dropper.Agent-7213133-0' and 'Win.Trojan.Agent-36166' further support the dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7213133-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7213133-0
  • 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
271273ff55fb4754cbcaf93cbe7944794d5bc79963d18cd2b0d559dfb444e07c		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84080 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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