PDF malware analysis — malicious · f4fe331530743979

MALICIOUS

PDF

4.9 KB Created: 2010-07-30 08:34:51 Authoring application: Qoperohaxomauecoviy (via 57583Riniuaruijoxe)

MD5: ebe09d980fae67c3af9b836e87497268 SHA-1: fb98f92e4de9f77c6d3e4c128160c86d6e512227 SHA-256: f4fe331530743979135d2c1b859153d825725bf2cb67645e8c2bd1b0cc33928a

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that is heavily obfuscated and uses an eval() function, indicating a stager designed to execute further malicious code. The ML classifier strongly flagged this PDF as malicious. The presence of PDF-specific heuristics like 'PDF_PAGE_WORD_XOR_EVAL_STAGER' and 'PDF_JAVASCRIPT' further supports the conclusion that this PDF is intended to exploit vulnerabilities and download additional payloads.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `102bd53c3d5aca19d3fddf2959dd86439856f01b130576912f06ee24f2e34ef8`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE66	487 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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