PDF malware analysis — malicious · c169837e40a8b824

MALICIOUS

PDF

4.6 KB

MD5: fa5d753cb0025359799f99b0a79eee9c SHA-1: 2a81e33f6d812f8abd5495d46edf0db9994188a5 SHA-256: c169837e40a8b8241867be40b0e50b0538d0110765dac233dd9df04549e17c4f

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager for malicious execution. The ML classifier strongly indicates maliciousness. The JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured by obfuscation.

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` `725b7386f6e9caae9e03f9492eb7f26f190197c23637c755c72761214d6aafe9`	pdf-javascript-stream	PDF /JS object 11 at offset 0xC9C	852 bytes

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