PDF malware analysis — malicious · 29d3c867e81aa238

MALICIOUS

PDF

3.9 KB

MD5: 0869d57d473deae9c9a230e1849ccba8 SHA-1: 4fd4154857d004145f6f247f8a2cf8b035252d1d SHA-256: 29d3c867e81aa238f3d47f8ec24998c62fb94750d3ec56e4e021ba44da1b0348

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as Pdf.Exploit.Agent-21456. The presence of eval() and String.fromCharCode in the JavaScript streams points to code execution and obfuscation, typical of exploit delivery mechanisms. The primary attack pattern involves leveraging these JavaScript capabilities to execute arbitrary code, likely for downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-21456 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-21456
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_obj111611_000.js` `2fa18b0e3ca0cf7d8c040cfb2f542149ce8315dcb01f58017f676f1302f0b566`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `ed83e999e74826dad58f577453fbaae89db38c020ad2233ad871560bb7161a39`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	5597 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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