Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d3d932c3e7509f…

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: 990543c21b8eac40c399ed8190e4e4fb SHA-1: ef1d976728b716fa272de366fbbc4f264e4ca8dd SHA-256: 72d3d932c3e7509f8ab349741027b920376ec8988e5c0c7100478360d5edba53
166 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The embedded JavaScript, though obfuscated, is indicative of a downloader or dropper. The primary function appears to be executing a second-stage payload, likely leveraging an exploit within the PDF structure.

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
63fd1ea2d9936922b125d5742893339ba589f4353dc2cd3cc7c3a2deaf9c1596		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74755 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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