MALICIOUS
74
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
The sample is a PDF file flagged as malicious by an ML classifier. Static analysis detected embedded JavaScript and the use of ASCIIHexDecode and ASCII85Decode filters, which are often used to obfuscate malicious code within PDF documents. The presence of JavaScript actions and embedded JS streams indicates an attempt to execute code, likely exploiting a known vulnerability.
Machine Learning
- Nyx PDF Classifier malicious score 0.9998
Heuristics 4
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ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEXHex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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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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ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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