MALICIOUS
142
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/JScript
T1204.002 Malicious File
This PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36178 and a machine learning classifier indicated a high probability of maliciousness. Static analysis revealed embedded JavaScript, including the use of String.fromCharCode and various decoding filters (ASCIIHexDecode, ASCII85Decode), suggesting an attempt to obfuscate malicious code. The primary attack vector appears to be the exploitation of a PDF vulnerability to run this script.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 6
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ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-36178
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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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String.fromCharCode low PDF_FROMCHARCODEString.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)
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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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