PDF malware analysis — malicious · 0e5337946e05cde9

MALICIOUS

PDF

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

MD5: a1c8c759a5031d61408e01f9765a70a8 SHA-1: de718f86112adfb87327d9d87ec9b7a4f4803605 SHA-256: 0e5337946e05cde954236f33583078f5b76d06f26e1c8db3e9102d4f4e900e9a

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, flagged by multiple heuristics, and is identified as malicious by ML classifiers and ClamAV. The JavaScript appears to be obfuscated but is designed to download and execute a secondary payload, indicated by the 'ML_NYX_PDF_MALICIOUS' and 'EXTRACTED_FILE_CLAMAV' firings. The presence of JavaScript in a PDF strongly suggests an attempt to exploit vulnerabilities for client execution, likely delivered via spearphishing.

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` `6aed552fe11e12280243186457ecdd7de8903b3b5c0923fbfdaff18ed1b29f42`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74223 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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