PDF malware analysis — malicious · 0fb964536a9ef851

MALICIOUS

PDF

7.5 KB Authoring application: Jgaxivakafowizasi (via 7f7baUohosicilab)

MD5: 180e85196c5ec063f3f46de8e8adeae9 SHA-1: 920570a9a246753cf4dbfbc69863b021cd6ebe35 SHA-256: 0fb964536a9ef851ae165f8dc498ac67200e4ca7a8efddd7cf41c244da7a944f

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML_NYX_PDF_MALICIOUS and ClamAV's Heuristics.PDF.ObfuscatedNameObject. The JavaScript code appears to be heavily obfuscated but is designed to execute arbitrary code, likely for downloading and running a second-stage payload. Given the nature of PDF-based malware, it is highly probable that this file was delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 3

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0011_000.js` `c35f939b8b08b4458e4f2307d4bfd0afc23546c955e11c1da88e87302e40c9b0`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1358	3029 bytes

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