PDF malware analysis — malicious · 73eb968e47bceebc

MALICIOUS

PDF

7.5 KB Authoring application: Jgaxivakafowizasi (via b9bd7Uohosicilab)

MD5: 50702319955ddf1741b334fbc9629a2f SHA-1: 8bb2fed56a717e9f808dbaa1033be1902ce046ef SHA-256: 73eb968e47bceebcedd1a4d384a6bffc993f29144625febd24c6fe949b61d236

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, flagged by multiple heuristics and ClamAV. The embedded JavaScript is designed to execute, likely downloading and executing a secondary payload. The obfuscated nature and the ML classifier's high score indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 4

Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
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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