PDF malware analysis — malicious · 4bc3d55fa50fdce0

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: 5bf93c45f689745ead08cc470bff0424 SHA-1: 16eb1d81c66671bf57365cc2fac3fbb96392f12b SHA-256: 4bc3d55fa50fdce003e652c317962b829ff8093136dc65f1dd26c1c08515b646

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by ClamAV as Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, which is often used to download and execute further malicious content. The presence of JavaScript actions and embedded JS streams strongly suggests this is the mechanism for payload delivery.

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` `3ad083a8ba9793ad5dab54cf75dc3f1361dc42067db8f520969b38fe66694956`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74951 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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