Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffda5def221dbfcc…

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: d9389e168e09ceb30e680775ce2e1a21 SHA-1: 25d1970e8d36f92e7f018c4d752938a0e31a7686 SHA-256: ffda5def221dbfcc3db026d4d3f9e3ee0db2d3fca56b8f9f1a798a13bb79607d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF was flagged by multiple heuristics, including a critical ClamAV detection identifying it as 'Win.Trojan.Agent-36166'. Embedded JavaScript was also detected, suggesting an attempt to execute malicious code. The ML classifier strongly supports the malicious verdict. The presence of JavaScript actions and streams indicates the file is designed to exploit vulnerabilities and download or execute a secondary payload.

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
f73c2bc650a23fdf2eaf7babbf9ab9a7a168c5f72e9099bf80a3c8060bd1fb39		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74386 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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