PDF malware analysis — malicious · 5b9495e8aace8d70

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: c5c60c7cdee633ef3c6c93527065553b SHA-1: fefdca5706bae2a5590b6d447f279764371b24b5 SHA-256: 5b9495e8aace8d704bc29fa91fba096c20b5bf59885c509bb8e0147c2c0acdaa

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript that uses string concatenation and XOR operations to construct and execute a payload. The script appears to be a stager designed to download and run a second-stage malicious file. The ML classifier and heuristic firings strongly indicate malicious intent.

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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