MALICIOUS
198
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/JScript
T1204.002 Malicious JavaScript
This PDF file was flagged as malicious by multiple critical heuristics, including a PDF JavaScript exploit cluster and a machine learning classifier. The presence of JavaScript actions and an unescape() call strongly suggests the execution of malicious code. The JavaScript appears to be obfuscated, but the core functionality likely involves exploiting a PDF vulnerability to download and execute a second-stage payload. The specific exploit and payload are not fully discernible from the provided evidence.
Machine Learning
- Nyx PDF Classifier malicious score 0.9991
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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Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JSPDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
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unescape() call high PDF_UNESCAPEunescape() found — often used to decode shellcode in PDF JS exploits
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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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