PDF malware analysis — malicious · 04e8c162d96181fa

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: 158945c36bc40b194ff046bd057f6094 SHA-1: 7528f5e778808b8335c0cc3d5892dd3fc6161fd0 SHA-256: 04e8c162d96181facc9ee85ded9461c245e429501a10602d9ea5eb234cc57c78

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by multiple engines, including ClamAV which identified it as Win.Trojan.Agent-36166. Embedded JavaScript, obfuscated but identifiable as a downloader, is present and likely responsible for fetching and executing a secondary payload. The presence of JavaScript and the nature of the detection suggest a common attack pattern involving malicious documents delivered via email.

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` `a0f52746430bddf7d38f9f5fbf6ead945beb4488b04128de571757737f9fbd4e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74426 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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