PDF malware analysis — malicious · 7b448a02ea8a690e

MALICIOUS

PDF

7.4 KB Created: 2010-09-16 18:55:19 Authoring application: Tolhipezorojpagiwaqo (via 7092aSeueganadazaqeav)

MD5: 988351119d1fd5102a4e7c4b905782b3 SHA-1: 217c3c1cbfd92b7f054962001e3faca8165efd25 SHA-256: 7b448a02ea8a690eda5f547a3e801a5857d5d26f7dd7d4ee117df2cad8bec108

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_OBFUSCATED_NAME_OBJECT' and 'ML_NYX_PDF_MALICIOUS'. The embedded JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for executing malicious actions. The obfuscation and presence of JavaScript strongly suggest an attempt to download and run a secondary payload, characteristic of a malicious document delivered via spearphishing.

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` `e2d41866c9fb013feb60cefe8b41892c7277decb0774febb940ce493b1221654`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1387	2332 bytes

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