PDF malware analysis — malicious · 563069c444e95f52

MALICIOUS

PDF

4.8 KB Created: 2010-04-21 04:29:03 Authoring application: Xawefamozma (via Mmopekiqaneji)

MD5: dc07d5050f4d70ebd22fa6cadb05cb22 SHA-1: 3591b5bd032fd5dfdc0069f5bd4496f72895e77a SHA-256: 563069c444e95f52b0ad07fec5d6ff42c4304bde9a84360ebbea3f9237fd9c58

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 designed to launch further malicious activity, likely by decoding and executing a payload. The ML classifier strongly supports the malicious nature of this PDF. No specific family could be identified, and the primary IOC is the embedded JavaScript file.

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` `9551cb29c148355e2c0a4889694047d07101ab5c93bed2d1b18aa9c461a0e7a4`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCF5	1301 bytes

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