PDF malware analysis — malicious · 9fd3e3ec0435b73b

MALICIOUS

PDF

4.1 KB

MD5: f869f748436e7d5645a6b35ad17753f3 SHA-1: 68fd64ac243742528688ca9c60c884df2dd5a5bb SHA-256: 9fd3e3ec0435b73b3cd01295b2f43e5a4bb9e3ee9b2cbbb44e99c1d54a86d99d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Dropper.Agent-1828858. Static analysis revealed embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated code execution. The ML classifier also assigned a high probability of maliciousness. The primary function appears to be downloading and executing a second-stage payload, as suggested by the dropper classification and the presence of deobfuscated JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828858 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828858
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` `44aa08b94aa4eba1ceecedf5606ba54a32f0c38bc8c3241992667ef7af5b1f31`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6397 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` `6dc44f7dd41d69a74c40ecf35a107903fe5cc4fc33c588e0204f0e92f90fa796`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3645 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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