PDF malware analysis — malicious · 257e83f3cc1ddf00

MALICIOUS

PDF

14.6 KB

MD5: 31e86385e30739fb823c541e08681ddd SHA-1: 9a3b0225397e65e5049ff13a8a7991eec69c9f36 SHA-256: 257e83f3cc1ddf00da532c806fb39726fda28edeb65a3e325ff341fe662d384d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1204.002 Malicious File: Malicious JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical ClamAV detection (Pdf.Exploit.Dropped-94) and the high-severity PDF_EVAL heuristic indicate the JavaScript is likely malicious and attempts to exploit vulnerabilities within the PDF reader. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, named 'javascript_obj0076_000.js', is the primary indicator of malicious activity, likely serving as a downloader for further malicious content.

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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