PDF malware analysis — malicious · 4c4b8e078bab82f5

MALICIOUS

PDF

15.5 KB

MD5: 28548f69629a4dea7b2a2ae4787218b9 SHA-1: f741ffa1fc968e3db3cadb461a9d4b52c6f33ec0 SHA-256: 4c4b8e078bab82f5bde79f80ead2e48fcc0121f05d6c4285e8cffb7fd1375602

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes an eval() call. The ML classifier strongly indicates maliciousness. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the obfuscated nature and the presence of extracted JavaScript files. The document body is unreadable binary data, providing no contextual clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0023_000.js` `d0b22fadc334cd3f13e6cb30c471b4d41191ccd687e11cd1c860d72ba158580e`	pdf-javascript-stream	PDF /JS object 23 at offset 0x3762	292 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_009_off000039e7.js` `68ca95ce98afc41a14cf799e5f7a288516473056f0aa8c2671414cd75b63c9ac`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x39E7	286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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