Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dadff4397892a07…

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 1c85b5b8b5eb5c638dac1241b525aeea SHA-1: c52a8f37c9db571664f2b55439da5c27669cca3b SHA-256: 0dadff4397892a072056aa0dbd7f1871ecb464fcfe18ecf76d9d82b25811dc2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV also detected the sample as 'Win.Trojan.Agent-36166'. The JavaScript appears to be heavily obfuscated, but its presence and the ML/heuristic detections strongly indicate it's designed to download and execute a secondary payload, likely leading to the identified trojan.

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
b75d8b39fcb919784cee1108168f025c74360d6cb4dc54e4c5d72d2eea775b18		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74263 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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