Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef12727717d40757…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: e0331187f1a749e11f8ac2e49b59196c SHA-1: d9bff349215bf3ae784f93c11f3978f795b5aeae SHA-256: ef12727717d40757f04690ea389979647a516b0f3a42367b5a0bdb70b84c8c2f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-17892' and an extracted artifact also detected by ClamAV as 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, suggests an attempt to execute malicious code. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves exploiting PDF vulnerabilities to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-17892 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-17892
  • 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
301d12881cadc7c483c36b486050a7670e22bd4df753e1e0048b367c24369309		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74782 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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