PDF malware analysis — malicious · b1ca6c707fee898b

MALICIOUS

PDF

26.4 KB Created: 2011-72-51 03:25:00

MD5: 9be01fcd7bbaaea4f57612d2c3f82e0d SHA-1: 17737544ea209058b6833abcbd65400e1a94a8d7 SHA-256: b1ca6c707fee898bc9c381f1397695e9bbe5f32a517e8bde003f6da0a289b4b0

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript, specifically an eval() call within a decoded JS stream, strongly suggests the execution of obfuscated code. This script is likely responsible for downloading and executing a second-stage payload, a common technique for PDF-based malware droppers. No specific family could be identified, but the overall behavior points to a dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Dropper.Agent-6290712-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6290712-0
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.
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_obj0001_000.js` `0b4899b9628988f740303b7b4fae6bb4b50f912af42afaa08839009e6f58b09f`	pdf-javascript-stream	PDF /JS object 1 at offset 0x64C3	996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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