PDF malware analysis — malicious · 84e44b9d6d7301a9

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: 64382e7636f531e8ba9b7cb136b5b4d5 SHA-1: 53a665fb5b59959660ce9c4f5599eda4e0b15353 SHA-256: 84e44b9d6d7301a932993eaf1e27c517b24614e7816ba9d61d476034d6c70e44

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, with ClamAV identifying it as Win.Trojan.Agent-36166. The embedded JavaScript, although heavily obfuscated, likely attempts to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams points to exploitation for client execution, and the file type suggests it was likely delivered as a spearphishing attachment.

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` `b069c1e756634ca65a9cda2968653e4e0a50b242a46732a3587292bfb99cc328`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74803 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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