PDF malware analysis — malicious · a964361e9b6c8090

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: e0e79d0f2cb1ad7803bc5fe77cbda927 SHA-1: e5c5e7d1cc21c93f437343086776ea8ff83e8abe SHA-256: a964361e9b6c8090c4f188e78cd57582fce4c34482a849b598f90638bf09f4c5

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by multiple heuristics as a stager. The JavaScript stream, named javascript_obj0011_000.js, is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates maliciousness, but the exact nature of the payload and its ultimate target cannot be determined from the provided evidence.

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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