PDF malware analysis — malicious · 63c35225ace4576a

MALICIOUS

PDF

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

MD5: e9390209caf549d8afdf1e169cbf911c SHA-1: 56c3d667ca95be081efb75fce86d3a8d9e48d2ad SHA-256: 63c35225ace4576a2371b00c95bc3efb4b5f3ddb6c7bfe029bced252ace75d62

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 ML classifiers and ClamAV, which identified it as 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, strongly suggests that the script is designed to download and execute a secondary payload. The JavaScript itself appears to be obfuscated, making a precise analysis of its actions difficult, but its execution is a critical step in the attack chain.

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` `dbf00049db4b4aeaabe8cd73e629ced547cfe20683c22f5b83bf3f8b142e467d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74674 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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