PDF malware analysis — malicious · 0c454acb4b881b46

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: c84dd146d47f89f27d881fb776ff9dc6 SHA-1: 17a4eddb9177566f7e1e7af889cf4f883129f0f5 SHA-256: 0c454acb4b881b4631eb23149b6fd0265e7b28c19f243c2a8a1922390434531d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The JavaScript is heavily obfuscated, but the presence of PDF_JAVASCRIPT and PDF_JS heuristics, along with a high ML classifier score and ClamAV detection (Win.Trojan.Agent-36166), strongly indicates malicious intent. The script likely downloads and executes a second-stage payload, consistent with a trojan agent.

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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `e8440c05da4a19bed86e1296a0e844b644a974d693a31447c500dc05585dff77`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75148 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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