PDF malware analysis — malicious · 342446f86991c1b3

MALICIOUS

PDF

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

MD5: 52050f032682caf5c926ea0eff7f8d32 SHA-1: 4b961530e685d2eeb3486dfe8124078a566ccf6b SHA-256: 342446f86991c1b36e523d75a0c658d29520f90b28977411799b9086d0a49660

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier, indicating malicious intent. ClamAV detection as 'Win.Trojan.Agent-36166' further confirms its malicious nature. The JavaScript is heavily obfuscated, but its presence strongly suggests it's used to download and execute a secondary payload, a common technique for initial compromise via malicious documents.

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` `d25525fdfcebd6d66a4bea4d4f18ce7d30c6fc2b16295a3eaea212b8941825a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74576 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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