PDF malware analysis — malicious · d583472d4e396938

MALICIOUS

PDF

11.1 KB

MD5: d9303f45092416f5fedfcdc05b98f9b8 SHA-1: 9e6c6759936f741ab54cd1198d46f839303e8e28 SHA-256: d583472d4e39693824887026265c18d1c409cdc4b89949da603ffa2b82bc4591

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contained embedded, obfuscated JavaScript. The JavaScript stream, identified as 'javascript_obj0007_000.js', likely attempts to download and execute a secondary payload. The presence of unescape() calls and ML_NYX_PDF_MALICIOUS heuristic further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0007_000.js` `1f4d74f425b799d4f7e65335f7d29850e761dc051a12fea5a2d821353f291e0e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	48356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 255 eval/decoder/string-building token(s).

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