PDF malware analysis — malicious · 0a854159be77f818

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: e2dfc848170c6ed1d19e714154a77820 SHA-1: 1ec8c52df1c79522485805f225fa8fbb2b0a3840 SHA-256: 0a854159be77f818ed67565e1b9df3b031d38b539cd3c44d23c42ee307607c2f

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that is heavily obfuscated. The script appears to be a stager, indicated by heuristics like 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The JavaScript reconstructs a function call, likely 'getCharCodeAt', which is then used to decode and execute a payload. The ML classifier strongly flags this PDF as malicious.

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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