Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ed6d17ef6d6e85…

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: 7673298ea996a32495ddb9d704ef635a SHA-1: 6320e0ec2774923556223b9a9a31d7415defe0ba SHA-256: 15ed6d17ef6d6e85b4b4d34ae6b31b0ed929251ad9aab46ed2c690aca928bb5f
166 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, flagged by heuristics and a machine learning classifier, indicating malicious intent. ClamAV detection confirms this, identifying it as 'Win.Trojan.Agent-36166'. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload, a common technique for malware delivery.

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
8331677a0cf2dbee4cf5dbef6b043a7f01c7f35825822b36eb1a50a2c62c345c		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74686 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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