PDF malware analysis — malicious · 1feb5fd2fb83d2f5

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: f64df778840b733c084a03051a8096de SHA-1: 0d88cbca59caed0f6f032d051a2568ba7f721240 SHA-256: 1feb5fd2fb83d2f5106913b66b48d3ab02a07873f351b53e9f3428559168872a

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious. The JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates malicious intent, and the presence of JavaScript actions within the PDF structure supports this. The exact nature of the payload 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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