PDF malware analysis — malicious · e9fa0449f540ab47

MALICIOUS

PDF

4.0 KB

MD5: f7e9f9e65d40fd7284f8a3d0b3af663e SHA-1: 40f0226f5201b8db69624abbe929d8dea0a142ab SHA-256: e9fa0449f540ab475fbb26dd1d1a8003f997cd9f5db6b6adcb1a346495deddfc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics indicate obfuscated JavaScript code that is likely responsible for downloading and executing a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature, identifying it as a dropper. The primary function appears to be the execution of malicious JavaScript to facilitate further infection.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1829074 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1829074
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` `8c9671604fa2e1b91eb1cda6c96f8b9da248eb00d69c7195b229a503ae95453d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `7dfdb8dc6a9227d0aaf14a97dec2cb1fce70cbe989d74622f6c545d96956c375`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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