PDF malware analysis — malicious · 1ebf126d6676126f

MALICIOUS

PDF

4.1 KB

MD5: eeee2f457a5f9f30ee752126341a66b9 SHA-1: 43da2c1b5304743fd86d776f374ccdf14456821f SHA-256: 1ebf126d6676126faef2c7c7527aa0248ba920e69def7eadd7dda2664e04ba3d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including obfuscated streams and calls to eval() and String.fromCharCode(). These heuristics, combined with a high ML classifier score and ClamAV detection as 'Pdf.Dropper.Agent-7237067-0', indicate the document's primary purpose is to execute malicious JavaScript. This script likely downloads and executes a second-stage payload, a common dropper behavior.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7237067-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7237067-0
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` `cb5f7bb95d658869198af8003bff5e591bbc31c8910469230a7eff24e9775cec`	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` `56418f48b4180fcb10d68f2bd8801f10b3c35c629bb404e36dac684e6253be40`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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