PDF malware analysis — malicious · 07121af637dd1333

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: 88ed73dbde6a9e88f2b96f8a5d432053 SHA-1: 531f8c864270a087d937a4e3b71ab9741090fb8d SHA-256: 07121af637dd133372f3aa40fa6af550c5cf823c217b2518d0ff4e8f60308c1d

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is obfuscated but appears to be a stager. The script reconstructs strings like 'getPageNth1OA8' and 'fromG0DChar' to call JavaScript functions, and ultimately decodes and executes a payload. This behavior is consistent with a malicious document designed to deliver a second-stage exploit or malware, likely distributed 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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