PDF malware analysis — malicious · 4f8443ad25e2451c

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: f0b2e00fc6c794f70425b7f5eb85ddd3 SHA-1: f1dbf51a6b9d9f36fcca2fa49fec06c435d98c53 SHA-256: 4f8443ad25e2451c00b941abb792f1cc001bc58ed642e13236489665866223f9

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a high-severity heuristic firing for a 'Page-word XOR JavaScript eval stager', indicating obfuscated JavaScript is used to launch further malicious activity. The embedded JavaScript stream, 'javascript_obj0011_000.js', is likely responsible for downloading and executing a second-stage payload. The ML classifier also strongly flagged this PDF as malicious. Due to the obfuscated nature of the script and lack of clear indicators for a specific family, it is classified as 'unknown family'.

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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