PDF malware analysis — malicious · 4ed3d6e4a06e2839

MALICIOUS

PDF

9.1 KB Created: 2009-08-27 21:37:52 Authoring application: nDcXMFgYTlcrvvyX (via ksGlbiKhLSfEKGKBT)

MD5: acf8f289a6009834b14744e704cf857a SHA-1: cbaf4d369a453bc0876f1927dc5706f48c52d6d9 SHA-256: 4ed3d6e4a06e283988b3ad3e2ac5526390071f71b734e72208bff551a4659c7f

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file was identified as malicious by a ClamAV signature (Pdf.Dropper.Agent-6308770-0) and a machine learning classifier. Static analysis revealed embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier's high confidence score suggests the PDF's structure is indicative of malicious intent, likely to execute the embedded JavaScript. The JavaScript itself is obfuscated, but the presence of String.fromCharCode suggests it's designed to construct malicious code or URLs. The primary attack pattern involves leveraging the PDF format to deliver and execute this embedded script, which is a common technique for dropping further malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-6308770-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6308770-0
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.
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_obj0007_000.js` `5c43de5310f462c65b18252a9c8ef63c1780ca7ee17d82ecacb170463df8363a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x3CE	7586 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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