PDF malware analysis — malicious · 75d72f989298dbc9

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: f0bd14f6beeb704f496aae0e56237b32 SHA-1: ebc22d5692289a9ecae562d3c747c76b7cb941ca SHA-256: 75d72f989298dbc9494db4b2ea46ffca9276e1963f6fb2a4ca86ce4f99585b0f

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream is obfuscated and appears to be a stager, likely intended to download and execute a second-stage payload. The presence of PDF-specific heuristics like 'PDF_PAGE_WORD_XOR_EVAL_STAGER' further supports the malicious nature of the document.

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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