PDF malware analysis — malicious · c870b4913816136d

MALICIOUS

PDF

2.5 KB

MD5: 2d0383e379fd66534825a92ce17ece8f SHA-1: a92df09d0b457cc2b7fe218d9d8f288f5c75b9db SHA-256: c870b4913816136d7a05bad3fa06cff7fe52cf10be944dacfc00fb21ae4a9e72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated JavaScript code is being executed, likely to exploit a vulnerability within the PDF reader. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-14208 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-14208
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `6d6345ba775ddec4a53c56edb7704bd82191b4196b2d4d79b6ea84d1f2f9556e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	373 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `29bb114423ba1308aaeb6ca2c6285abe5cab2d06e68b65578824bb3b4aa9d669`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x249	2948 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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