PDF malware analysis — malicious · c4f383febc71ed0f

MALICIOUS

PDF

14.6 KB

MD5: 3504ac31511f3ee2c8e5052903609f61 SHA-1: 457306cb3915ad5234256b6737562abc12efe9ed SHA-256: c4f383febc71ed0f23d13a96303d1ed6df657eadebb7546353f9f2660d6f712f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript

The PDF file was flagged as malicious by a ClamAV signature (Pdf.Exploit.Dropped-94) and an ML classifier. It contains embedded JavaScript with an eval() call and uses String.fromCharCode, indicating obfuscation. The JavaScript is likely responsible for executing the exploit within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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.
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_obj0076_000.js` `c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288`	pdf-javascript-stream	PDF /JS object 76 at offset 0x38E9	144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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