PDF malware analysis — malicious · 18d06afb4018da80

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: 33fbdaa40be04b055c6b8a7d01768698 SHA-1: c87ce76ea36340a20f1466ff399b2fd1932090ac SHA-256: 18d06afb4018da80f6b2e99f3a7447d7a4c1ee902a9ad1a92d0e0a1d888ec56c

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is obfuscated but appears to be designed to download and execute a second-stage payload. The script uses string concatenation to construct function names and values, ultimately calling a function that likely executes the downloaded content. The ML classifier and heuristics 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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