PDF malware analysis — malicious · c9fdb05e4072c04d

MALICIOUS

PDF

3.0 KB

MD5: e9b658a4f433c768c2d7a39a55d8f940 SHA-1: c6062d22a791a79f05d868d3ff3f41ad1e9fa1a7 SHA-256: c9fdb05e4072c04db6578175599c00f667b74c0e931b21d6d6c834d42435fc5d

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a dropper. Embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS, is present and likely responsible for the malicious behavior. Although the JavaScript content itself was not provided in detail, its presence within a dropper PDF strongly suggests it's used to download and execute a secondary payload. The ML_NYX_PDF_MALICIOUS score of 0.999975 indicates a very high probability of maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7685828-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685828-0
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `efdd56b1641b1e3f48861603a47d581cc98707c31d7677d8fcba680c02fdf801`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	20841 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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