PDF malware analysis — malicious · 00dfe04907cc5de4

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: 60604e7ba798f56521bcaa6eb8292a7f SHA-1: 432640978d46babad05636a777120f517c4b3bdd SHA-256: 00dfe04907cc5de4a8e84fccbdc15db5057e232a8c1df7aee8e98c3a4ad2e329

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains a high-severity heuristic firing for a 'Page-word XOR JavaScript eval stager' and an embedded JavaScript stream. The JavaScript code appears to be obfuscated, but it reconstructs a string that is then passed to the `unescape` function, likely to decode a URL or shellcode. The script's primary function is to download and execute a second-stage payload, as indicated by the use of `unescape` and subsequent execution of the decoded content.

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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