Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e112b222f2810b6…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: dddf378c4aeb96fd0fb176c18c96f02a SHA-1: ab8d82538ad3494b11e279f8c625d4a7b1eef051 SHA-256: 5e112b222f2810b68b61c440942957255a763329ff8a6c2472be0ecc652fd57c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV also detected it as 'Win.Trojan.Agent-36166'. The JavaScript appears to be heavily obfuscated, but its presence and the ML/heuristic firings strongly suggest it's designed to exploit vulnerabilities and download a secondary payload. The 'Spearphishing Attachment' technique is inferred due to the nature of malicious PDFs.

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
6dd0d9bf24e4f2164f8e4484f682635a28bdb9080583a0aaf7b1e186993a3a37		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74711 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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