PDF malware analysis — malicious · 03c5a8c698905079

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: f87b61031eda33e188793cbee99ad86f SHA-1: 95fe10e5adb0fd6f0365c1766ecea3604ccbbe9c SHA-256: 03c5a8c6989050793ec1931c1775940ed9a6f37553dc25383c2ac27636627913

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded JavaScript which is heavily obfuscated but appears to be designed to download and execute a secondary payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36166'. The presence of JavaScript actions and streams strongly suggests an attempt to exploit the user via a malicious 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` `a53d1fa4342385680967cc811d7c67bcb6833d0b7c964685eb6044ef29819bcf`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74322 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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