MALICIOUS
146
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
This PDF contains embedded JavaScript, flagged by multiple heuristics including a PDF JavaScript exploit cluster. The JavaScript utilizes eval() and String.fromCharCode with URI component decoding, indicating it's designed to deobfuscate and execute malicious code. The primary function appears to be downloading and executing a second-stage payload, though the exact URL is obfuscated within the script.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 4
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF 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.
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eval() call high PDF_EVALeval() found — commonly used for obfuscated exploit execution
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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