PDF malware analysis — malicious · 141b36ac7542c689

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: f0985927f8d75256217c24e435163e92 SHA-1: 6812b2392e976d548b089bb23727399b481bd670 SHA-256: 141b36ac7542c68993d1ddccbe8f19520de0b9f7c8c0394438726f94e7cdabca

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded JavaScript which is likely responsible for downloading and executing a secondary payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36166'. The obfuscated JavaScript makes it difficult to determine the exact download URL or execution method without further dynamic analysis.

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` `e13872ef6659649f66c9110a65d1a6cff84a201a8bb64bdf99e06bc1d432f96e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75146 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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