PDF malware analysis — malicious · 9354ac2002bfe813

MALICIOUS

PDF

4.0 KB

MD5: fe8039ba3089b9932835fe942b02416d SHA-1: a976e90f2863e8771996fc9cdfc233d669e2478b SHA-256: 9354ac2002bfe8139084942c90a0685d9b1fcf76c5ce75d75b38cff566d7b18e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by multiple heuristics, including a high-severity PDF_EVAL rule indicating the use of eval() for obfuscation, and a critical ClamAV detection for Pdf.Dropper.Agent-7283558-0. The presence of embedded JavaScript, specifically the deobfuscated javascript_obj0013_001.js artifact, strongly suggests that the script is designed to download and execute a secondary payload. The ML classifier also assigned a very high probability of maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7283558-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7283558-0
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_obj0013_001.js` `dda3ede701f5a4b042cbafb908d4b6a5a226aba9fe9b0ebf97730a060dc38ea6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `9977bca63c83bed5b13d4b27326e7cd7246be2b1216e49b25a666a97922d7fca`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3574 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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