PDF malware analysis — malicious · b34f77163581b73f

MALICIOUS

PDF

4.8 KB Authoring application: Cawwavvwcejec (via 3b1a4Bafizouauewikqoqi)

MD5: 34df968ccdd1fb9f9f7306f21cf38f69 SHA-1: 26617ce931eb98196a2d1258c92e07b6f55090c2 SHA-256: b34f77163581b73f0b87fbb837946d00c2b4d43435d5ff71fda3eba87467f100

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 document body is heavily obfuscated and unreadable, providing no further context.

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` `a3a55ad2b262186b464f5fbcd00d106ed618ec3ad1804351ed5c427901f464cc`	pdf-javascript-stream	PDF /JS object 10 at offset 0xE23	518 bytes

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