PDF malware analysis — malicious · a857fae3e092170f

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via 92c09Ylojoppekaxopqi)

MD5: a4f0900fb2b77deef086ddb8613a666d SHA-1: 019ea03b51122b6c50706c88e29e27a9ac414f28 SHA-256: a857fae3e092170fe3fdd3dfdd8eb3301177ba04e75bb38386f9295f9e20faea

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, flagged by multiple heuristics as a malicious stager. The JavaScript is heavily obfuscated, making its exact function difficult to determine, but it is designed to execute a payload. The ML classifier strongly indicates maliciousness. Given the obfuscation and the nature of the PDF, the likely attack pattern is a lure to execute a second-stage payload.

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_obj0008_000.js` `c510f8c6a5031d17c6606a6a4e88ede1c3452bf51c2d06efb7ba03d3692fec56`	pdf-javascript-stream	PDF /JS object 8 at offset 0xF52	1346 bytes

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