PDF malware analysis — malicious · 8570e8f08dbbc0bd

MALICIOUS

PDF

14.9 KB

MD5: e7afd43ff46f8e33cd88f230d97c802b SHA-1: 474b8560387a58cee9fee3324bcd0d0d172edaae SHA-256: 8570e8f08dbbc0bdb601ea217d3e5b440dcb454139e627e2d2705a5466d88b72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation and execution. The deobfuscated JavaScript appears to be designed to download and execute a secondary payload, indicated by the 'PDF JavaScript exploit cluster' heuristic and the ML classifier's high confidence score. The presence of obfuscated JavaScript streams and the exploit cluster strongly suggest a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `f88ece1fb7696bd020dbc4aed6fba5ce0f27d88f082ada280aebfccf87a98a92`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `fed16665b474626673eb3bc34ac1d6da1569226379a89be5e8b02cb853a15400`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x18B8	11803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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