PDF malware analysis — malicious · 7218f3af3f4d5411

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: f992ac13e3d189b75b274a6ba71d5979 SHA-1: 45447c4ddc2f86e3beb14c622640cdc1a10c6738 SHA-256: 7218f3af3f4d5411de3a6217ce0c202ad6941e0792d7a6d0be10333ae2d43347

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as 'Win.Trojan.Agent-36166'. Embedded JavaScript, although obfuscated, is present and likely responsible for downloading and executing a secondary payload. The presence of JavaScript actions and embedded JS streams strongly suggests this technique.

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` `3d1d3f229fb4687b5e4f12251ac2089617f135d4cb6610e59e2fb3cd52a5326a`	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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