PDF malware analysis — malicious · 45dcbc67f44aee5e

MALICIOUS

PDF

4.3 KB

MD5: f7643ccfef46a4e4cb106eacb6b8c0c8 SHA-1: 1932fab44d787eff2cd8fdb9b6cbd153c7d47d29 SHA-256: 45dcbc67f44aee5e8cd8d457331827e5354280691d7fd99d2db0b95f158dacb5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as javascript_obj60472_000.js, likely contains obfuscated code responsible for downloading and executing a secondary payload, as suggested by the PDF_EVAL and PDF_FROMCHARCODE firings. The extracted artifact name also points to a JavaScript object.

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj60472_000.js` `bc935a2c7b62a251f343b341070fae8ded12a7f03e785b7af450f22f9f665212`	pdf-javascript-stream	PDF /JS object 60472 at offset 0x138	8299 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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