PDF malware analysis — malicious · 5b853afa7f689ddd

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: 1bcb15204926afc1abe1d00d76eeb164 SHA-1: 3485bb1d3e8859b7224fb717e3741163872b618c SHA-256: 5b853afa7f689ddd5efb22a343e2a2390a5c9a79b14ea4d6369a43b99acaa7cb

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 a machine learning classifier and ClamAV, which identified it as Win.Trojan.Agent-36166. The embedded JavaScript, although obfuscated, is indicative of an attempt to exploit vulnerabilities within the PDF reader to download and execute a secondary payload. The presence of JavaScript actions and embedded JS streams strongly suggests this attack vector.

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` `825a4f8a5e9cf022d81b21e68f361ac90d26e8b68c0135628421ffcb1ba326e3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75162 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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