PDF malware analysis — malicious · a2c8dbaad40f4321

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: fc7389d7e31dd947e67f3c162f84f889 SHA-1: 0f7632ce9a566196bd4a75ef18ac023e15c29e1e SHA-256: a2c8dbaad40f43214548b9dad0be6c29ed885247ebd948611b519101054a3932

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics as a stager for executing further malicious code. The ML classifier strongly indicates malicious intent. The JavaScript stream, named 'javascript_obj0011_000.js', is the primary artifact responsible for the payload delivery, though its exact function is obscured by obfuscation. This points to a common pattern of using PDFs as initial droppers for more complex malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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` `1ec398366107a5fedd9bcf18a57f32d68d58e87986c8ad1c876f457b209e2152`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCA2	815 bytes

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