PDF malware analysis — malicious · 8bffeefafb050f88

MALICIOUS

PDF

1.6 KB

MD5: eabcd17e8b8c485f17235eefac95cb71 SHA-1: 46e710698a1dde59851c62927071d49991ead4cf SHA-256: 8bffeefafb050f888fff4ec607427f7156b8100e70e002ddbcbf72ddf9bdde25

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL heuristics. The embedded JavaScript file, javascript_obj0009_000.js, likely contains code to download and execute a second-stage payload. The exact functionality of the script is difficult to determine due to obfuscation, but the presence of eval() and String.fromCharCode suggests dynamic code execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0009_000.js` `fd371157419ecbeabc593d063f12b8539a1038742aabda3682b3db881a925a68`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3910 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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