PDF malware analysis — malicious · f71ab7a022009d8b

MALICIOUS

PDF

4.6 KB Created: 2010-04-30 20:50:48 Authoring application: Remefehoditijol (via Navowezaxohagadetod)

MD5: c75ad877951e295eb07246989998707a SHA-1: 9fab6b0905234694113c54f880513fd853e071b0 SHA-256: f71ab7a022009d8b3b88b13876752c2d383e97aaf7873e7164652a9c3b96972c

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics as a high-severity stager. The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic. No specific family could be identified.

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_obj0010_000.js` `ee2e511ba8ce3549b23f24d7507787bbba67f242a0b1f41c47d363925ddfc2ab`	pdf-javascript-stream	PDF /JS object 10 at offset 0xCC8	817 bytes

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