PDF malware analysis — malicious · 18eb4c8beb25159a

MALICIOUS

PDF

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

MD5: 4583ec066f8be24e17c7ad14b4fa5290 SHA-1: 9646c5ea22ded82ba654868678d37bce1f1a8b79 SHA-256: 18eb4c8beb25159a13574b32c21e0134f0813a3a169b78f3c6da7c2aed0455ab

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The JavaScript is heavily obfuscated but its presence and the ML classifier's high confidence suggest it's designed to exploit a vulnerability and download a secondary payload. The ClamAV detection further confirms the malicious nature of the file.

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` `2f31717692f91856a7912c9ead52ed2a790b0c5e029c1c8019cb119ad7d60f8f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	84229 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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