PDF malware analysis — malicious · bbeda05b4a9ed1d8

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: fff4c200bae1d06f7b8842a18bb9cdf8 SHA-1: 294c61674a39f5a05c27c53a912f5da8b5ca9596 SHA-256: bbeda05b4a9ed1d83eead89612d05605f5f7baa3b0c9b8e2994940fb0115c392

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for executing a malicious payload. The exact nature of the payload and its execution method cannot be determined due to obfuscation, but the presence of JavaScript indicates an attempt to exploit vulnerabilities or deliver further 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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