PDF malware analysis — malicious · a090e143bc72da62

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: db07230f0740ef07c750be15bc081f99 SHA-1: 51d70eeabce9710bf65dbd894d31e55f57a78933 SHA-256: a090e143bc72da6284417b3f1573dd7fdb3fb5ad8aa9cdf133f05fc99036c7db

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, flagged by PDF_JAVASCRIPT and PDF_JS heuristics, indicates an attempt to execute code. The ML classifier also strongly suggests maliciousness. The embedded JavaScript is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload.

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` `f63e853a022be3562f4bdb75ee052d9b51b6fc4ef9a89421bd00eddae0d42c86`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74851 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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