PDF malware analysis — malicious · cf00b4881aa7bc27

MALICIOUS

PDF

3.0 KB

MD5: 123e39d85955c52c953307b6c13d6601 SHA-1: b9fc5216dfcd879fe7d16b80137bd3dff5808dea SHA-256: cf00b4881aa7bc27ee7e04e10a7aadcc5ab4e9d761f916ef792a027eaaf6f25b

116 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 (Pdf.Dropper.Agent-7306129-0). Static analysis revealed embedded JavaScript, including the use of String.fromCharCode, indicating obfuscation. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the 'javascript_obj0009_000.js' artifact and the ML classifier's high confidence score. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7306129-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7306129-0
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` `3714e5611d052761c61697efd2daa42957389045c0c6a29ad3c60b01c5de614a`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	20913 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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