PDF malware analysis — malicious · 38791768aef8de33

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: a6a10a793bdedad3fd5c0ec44a16d8ee SHA-1: cef39924f13235884d28d94f187b762c96110470 SHA-256: 38791768aef8de331d85ba8b34424932b870f8d8fbc517240bd240d86f189c36

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections for 'Pdf.Exploit.Agent-12503' and an extracted artifact 'Win.Trojan.Agent-36166' strongly suggest this PDF is malicious. The ML classifier also flagged it with high confidence. The embedded JavaScript is likely responsible for exploiting a PDF reader vulnerability to download and execute a secondary payload, consistent with common PDF-based malware delivery techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-12503 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-12503
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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `53fc539f60a65da37994a2842f13edcbd2c82e9d0256182ec328385a9056d019`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	73833 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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