PDF malware analysis — malicious · 87c8328428d6a8f3

MALICIOUS

PDF

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

MD5: feb52581004a7aa8dfd350585e9184b2 SHA-1: 8344205d5ec5e20bf95d90180c3c1b88e27f0bc3 SHA-256: 87c8328428d6a8f3c83b26c024c663b49647eee5d6c6d4a79cbe9d736bec7f0a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by multiple engines, including a high-confidence ML classifier and ClamAV, which identified it as Win.Trojan.Agent-36166. The presence of embedded JavaScript, indicated by heuristic firings, suggests an attempt to download and execute further malicious content. The exact behavior of the script could not be fully determined due to its size and potential obfuscation, but its inclusion is a strong indicator of malicious intent.

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` `e65e75cf614118e97c210e5b6c6b6c39325a156053e80f320dfe9e443c4f9c0f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75926 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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