PDF malware analysis — malicious · c33d91c72e226539

MALICIOUS

PDF

4.6 KB Created: 2010-04-30 20:47:26 Authoring application: Fodebarexa

MD5: e1fa75bf69b680d6d936b7aa927d661a SHA-1: 0c067a5bb130050ee50ef902be59177900394368 SHA-256: c33d91c72e2265394725fe8c9fdadf98c9b5d651cb85b3a4ff162ac5eae5c064

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic indicates that this JavaScript is used as a stager to launch further malicious activity. The ML classifier strongly suggests malicious intent. The JavaScript stream is the primary indicator of the attack vector, likely responsible for downloading and executing a secondary payload.

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` `7ad1ee8cba7784f1a95b635244a4165fad123a151fe73c8fc9a0d61755caba74`	pdf-javascript-stream	PDF /JS object 10 at offset 0xCAB	874 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.