PDF malware analysis — malicious · 1aae6c185590a502

MALICIOUS

PDF

6.2 KB

MD5: e445490d214903c7b47bdaebee4d65b6 SHA-1: 98d418b4d62140116055933ea900846201d040a0 SHA-256: 1aae6c185590a502055ccda4eff4477ef458ff34bd02e625a08f5bb6100f4a40

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager for executing obfuscated code. The ML classifier strongly indicates maliciousness. The JavaScript stream is the primary mechanism for the attack, likely serving as a downloader for further malicious activity. The document body contains garbled text, suggesting it's not intended for direct user interaction but rather to mask the malicious script.

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_obj0016_000.js` `582f0561023923b6daa9bcc92feaaf0fbb54e96e3632caa091aff741933d4637`	pdf-javascript-stream	PDF /JS object 16 at offset 0x12A9	1368 bytes

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