PDF malware analysis — malicious · 0c52c2f70d4ba71c

MALICIOUS

PDF

6.3 KB Authoring application: Woibneqeni (via 823fdUzenwzijecijawida)

MD5: 7991a3da6fbfccaa970cbb6331461f29 SHA-1: 7a1093e839249512e6cd284d674214e49c944f86 SHA-256: 0c52c2f70d4ba71c774201eb851918fb532a009218f84eb8d5415991463876db

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 of hexadecimal values which are then evaluated, likely to download and execute a second-stage payload. The ML classifier and heuristics strongly indicate malicious intent, and the overall pattern suggests a 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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