Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc64704a63174895…

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: f21f2b96509ee941d912b9842558f0eb SHA-1: 43a5b8e5590c0e2c363e822bf752888477ceaf43 SHA-256: dc64704a6317489567505094b01d2966fd10ad4f760641a3175f8eba865a9c23
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, suggests that the PDF is designed to execute malicious code. This JavaScript is likely responsible for downloading and executing a secondary payload, which aligns with the identified malware family.

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
99aad9a86dce2b4912d46ad18ba9c53c0278f85f3afe80520ad15c53d6c658d1		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74908 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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