PDF malware analysis — malicious · 4daf03ce1e9323f4

MALICIOUS

PDF

226.8 KB

MD5: 306f2daa8cd9ecce69663f8abe066501 SHA-1: dd802754554f41e821cea68d5188bc70408ffb7b SHA-256: 4daf03ce1e9323f440f03d0e93221068f37b720f6d79fb5c5d2f4000f9e02710

152 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. A critical heuristic identified a VBScript-style decimal byte array that decodes to a PE payload, suggesting the PDF's primary function is to deliver and execute a secondary executable. The embedded PE artifact has a SHA256 hash of 43f9503481ba9d7ce2a96f0b839641504b18b776e2c3fe8d4b21a83c46d5642a.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 3

VBScript-style decimal byte array decodes to a PE payload critical PDF_VBS_DECIMAL_ARRAY_PE_PAYLOAD

PDF comment text contains a VB/VBScript-style decimal byte array, such as c(077),c(090), that decodes to a verified Windows PE executable. The rule is gated on a comment-line Array(c(...)) assignment and a valid MZ/PE header to keep false positives low.
ClamAV: Pdf.Dropper.Agent-7212335-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212335-0
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
`decimal_array_pdf_pe_00000229.exe` `43f9503481ba9d7ce2a96f0b839641504b18b776e2c3fe8d4b21a83c46d5642a`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	32945 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.

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