PDF malware analysis — malicious · d6863590f3bb5014

MALICIOUS

PDF

2.1 KB

MD5: 1ad0e833586cad1cbef4dc83dd120234 SHA-1: 6e30ada9305a5bb011634c2623fb76c6c80fd744 SHA-256: d6863590f3bb50141f7a2ad91811b6a27dc6538a312bbb58750f42e80a52d4cc

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function of the embedded JavaScript appears to be the execution of obfuscated code, likely to download and execute a secondary payload, as suggested by the 'Pdf.Dropper.Agent-7309592-0' ClamAV signature. No specific malware family could be confidently identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7309592-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7309592-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x75A	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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