PDF malware analysis — malicious · 145f992ee9adc2a8

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: 824425caed8056e72bc2c1030e8776f8 SHA-1: 8359202a1f4d9b1a8fbf4f1e8f412a42f22ac8f7 SHA-256: 145f992ee9adc2a8c46f51bb28fea57f988290d834f5985f48829be31ee1c7e5

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript, identified by heuristics like 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. This script uses string concatenation and character code manipulation to reconstruct and execute a payload. The script's primary function appears to be downloading and executing a second-stage payload, as indicated by the use of functions like 'unescape' and 'charCodeAt' on reconstructed strings.

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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