PDF malware analysis — malicious · e68521f8814451d9

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: e8caa2585d8f63f1b86bb7b96af4bbf4 SHA-1: 8747a6d6ba2cabdbef2ffaafb207eea937e0eb1d SHA-256: e68521f8814451d93a8f97bb883eae31918ea9577a13fa5b28a11bedbf9aff17

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics as a page-word XOR JavaScript eval stager. This suggests the script is intended to deobfuscate and execute a malicious payload. The ML classifier strongly indicates maliciousness. The exact nature of the payload is unclear due to obfuscation, but the presence of JavaScript points to a common delivery mechanism for malware.

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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