Malicious PDF — malware analysis report

Static analysis result for SHA-256 15641854e5fc8972…

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: 4bbb030a63cda53bca11a75d6a722bcc SHA-1: b120ed38d038605caaf177b57ade92aab884078a SHA-256: 15641854e5fc89723e0519b6f88cefcc3c64e07be7e74c1b318ec38234bace49
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple engines, including ClamAV identifying it as Win.Trojan.Agent-36166. It contains embedded JavaScript, indicating an attempt to exploit vulnerabilities and execute code. The JavaScript's obfuscated nature suggests it is designed to download and run a further stage of malware.

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
e482da8e01da643985f312e9b54eb94c06a1a694b31864974ec467f25db86443		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74858 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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