PDF malware analysis — malicious · f319f6857c94efe2

MALICIOUS

PDF

6.2 KB

MD5: e0979df647297dd85ea6217406114104 SHA-1: dfd013d27e01fc866195d843a6c5f177935e0de5 SHA-256: f319f6857c94efe2340625d343d79af0ac9f35a83a2c6a690009ff63fd50952c

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple high-severity heuristics as a stager. The JavaScript is obfuscated and likely intended to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness.

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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