PDF malware analysis — malicious · 0e63e9aaee4c2fd8

MALICIOUS

PDF

6.3 KB Authoring application: Woibneqeni (via 3c33bUzenwzijecijawida)

MD5: 27dfbdd523b0fecfc2700b38fbb40043 SHA-1: cfa2e0c08d3f8cc6c85391300e870bbc4c0bc278 SHA-256: 0e63e9aaee4c2fd831ed0d777ca445904c396b9b3579bf1ae4ff7b9970dee132

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is obfuscated but appears to be a stager. The script reconstructs a string using XOR operations and then executes it via `app.eval()`. This suggests the PDF is designed to download and execute a second-stage payload, likely leveraging the `T1059.007` (JavaScript) technique. Given the nature of malicious PDFs, it's also classified under `T1566.001` (Spearphishing Attachment).

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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