PDF malware analysis — malicious · f4e230d2bb207a1e

MALICIOUS

PDF

3.9 KB

MD5: e1cda52f49b33f4549e5dc98a60bcc99 SHA-1: f8a9310bd62b6dee6888849f0f9db643354a5524 SHA-256: f4e230d2bb207a1e15a1115b30a265f6315ca41e7e0e3f19e880722ce80468f1

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious due to obfuscated JavaScript content. The embedded JavaScript, named 'javascript_obj0034_000.js', is likely responsible for executing malicious code or downloading a secondary payload. The presence of JavaScript actions and streams within the PDF structure strongly suggests an attempt to exploit vulnerabilities or deliver malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0034_000.js` `27384db176a44517d53a8587d44aeb034de425f889edb907b18699a614f0d380`	pdf-javascript-stream	PDF /JS object 34 at offset 0xE7	16105 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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