PDF malware analysis — malicious · 1887a719dd18cb97

MALICIOUS

PDF

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

MD5: 8922bf7b1f441dae4fc25e55bab7024d SHA-1: 1373a397d1405fb9c98f57a90f7d51feb77eeaaa SHA-256: 1887a719dd18cb9794c4e780d55995618cc0442cd49e8719051f6cd106a856f1

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, which identified it as 'Win.Trojan.Agent-36166'. Embedded JavaScript was detected, indicating the likely execution of a secondary payload. The obfuscated JavaScript, while not fully decipherable, strongly suggests a downloader or dropper functionality, consistent with common malware delivery techniques.

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` `288f32188e91d5207fc87534f87c2e2a7e414f788d6e9d800e368f900b9cf79c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	83592 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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