PDF malware analysis — malicious · 650ac065b5e103d4

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: 138b177fcb60658a01a999fe927ae018 SHA-1: 9ccdfee414ffb142fbad10682be4281f2833ac2e SHA-256: 650ac065b5e103d436484ed331065e692e9b1f673758cc4f7fc32aaac15782b3

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 engines, including ClamAV which identified it as Win.Trojan.Agent-36166. Embedded JavaScript was detected, indicating an attempt to execute code within the PDF viewer. The ML classifier also strongly indicated maliciousness. The primary attack vector is likely exploitation of a PDF vulnerability to download and run a secondary payload.

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` `c768ddac6b8dad41f451f25441e4fa6ce4ddc9b708841ade64e6a3377330e092`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75151 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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