PDF malware analysis — malicious · a8f23a365ed652ab

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: f6ec051ee0ffcf14ae2f6fe4a666c09b SHA-1: 35e324821f8c741711951fb499b13628a15cb6c2 SHA-256: a8f23a365ed652ab323cf86c311358db16a11bf8012278d9c44d333966b3061c

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by multiple heuristics as a stager for executing code. The JavaScript stream is obfuscated, making it difficult to determine the exact payload, but its presence and the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' firing strongly suggest it's intended to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

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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