PDF malware analysis — malicious · f86c3731d06c4588

MALICIOUS

PDF

291.8 KB

MD5: dc573f9f951262a2d9e0a4b0d4ca7cb8 SHA-1: ba666a8094cd9d5d1f68a78e9a6fbd536b5644ce SHA-256: f86c3731d06c4588c81158f386f71b8f1d4ccc1b92dcbfb64d03ebfdfaf713f3

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, javascript_obj0008_000.js, is likely responsible for executing the malicious payload, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0008_000.js` `2cf10c240e01e9ef6d8bb9cd5b8c530dcc1a2230e16a71b7f9b953a17ea109b6`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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