PDF malware analysis — malicious · fe772137d6fcfcae

MALICIOUS

PDF

4.8 KB Authoring application: Zfocakegegau (via 857eeJagawemriks)

MD5: a5bedb96a2e02883b252e0dfaf9795b9 SHA-1: ffef21878db6a77620c32041cc41fc39b8529421 SHA-256: fe772137d6fcfcaeb333d6bc88a670f5517af523c42f18a11adafe352f8aaa1e

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager. The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic. The obfuscated document body and the presence of JavaScript point to a common PDF-based malware delivery technique.

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_obj0011_000.js` `bf7a432ff35833548ed0a031b46738ab01327f10111cc1d09640c705da1dcf51`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE8F	500 bytes

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