PDF malware analysis — malicious · 62eacd80e3e82c03

MALICIOUS

PDF

6.3 KB Authoring application: Woibneqeni (via 2fc40Uzenwzijecijawida)

MD5: e1cf6c0b2dbdf5c78d6aa0615b512080 SHA-1: 0881f1d3be93d3b91f7b9371d62e140efa39acda SHA-256: 62eacd80e3e82c0396996eb3f5a7b9602ffc0edba5eee11f9a2be47f4f2a2efb

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that is heavily obfuscated. The script decodes and executes further JavaScript, which is a common technique for downloading and running a second-stage payload. The ML classifier strongly indicated maliciousness, and the presence of JavaScript execution points to a downloader or exploit delivery mechanism.

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` `e5fb7241b86520d30618ed164f0373984e043b354e933bd4bfa81c848e06fafc`	pdf-javascript-stream	PDF /JS object 10 at offset 0x11B0	1464 bytes

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