PDF malware analysis — malicious · 40a906a6a2cd55d2

MALICIOUS

PDF

25.4 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: ad3759ec2275b10fc599579c48611bdd SHA-1: f416c63479f9203c97faf71c1f721495e5324011 SHA-256: 40a906a6a2cd55d2c00a065045a1b22e27651bd843bf5c3c6ae4fdcf365d1339

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains JavaScript, specifically utilizing String.fromCharCode and an eval stager within its metadata. This indicates the file is designed to execute arbitrary code upon opening. The ML classifier strongly supports a malicious verdict. No specific family could be identified due to the generic nature of the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `3b4d10fe95c58a7b3e6676b2b715013f11b79fab6b9b6bac6a2a09ac58c8aeac`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62CA	520 bytes

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