PDF malware analysis — malicious · 128f8dea87209bcf

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: 2a4853d350c29fcb36fdc40c948378ca SHA-1: 184f25ac2b9999c0b568d38adbc11b2d91686c7f SHA-256: 128f8dea87209bcf341259e4547131d27dd4f30608218c3fa7e77e41d2adfda2

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is obfuscated using XOR operations and string concatenation. The script reconstructs the string "eval" and uses it to execute the deobfuscated payload. This indicates the PDF is designed to act as a downloader for further malicious activity, likely delivered via spearphishing.

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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