PDF malware analysis — malicious · f31e81d7389fe25c

MALICIOUS

PDF

68.0 KB First seen: 2026-06-09

MD5: e48b0bd84ee3a4458946bbfcc8813d96 SHA-1: 8220b99953bb0e26e41d150de2f8727d0b2eb4ac SHA-256: f31e81d7389fe25cb9cfcc85f7432bc597366217f66e0677553b198c2aca3b72

130 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9952

Heuristics 2

Base64-encoded Windows executable payload in PDF critical PDF_BASE64_PE_PAYLOAD

PDF text contains a long base64 blob that decodes to a verified Windows PE executable. This catches payloads hidden after EOF, inside comments, or in plain text outside normal PDF streams.
Suspicious extracted artifact high 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
`base64_pdf_pe_00000284.exe`	embedded-pe	PDF raw base64 PE payload at offset 0x284	51712 bytes
SHA-256: `ecc4b014903220c65342275422a6f1c9de1f29bf379be44e7b83f97cf2243ce0`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=PE; declared_or_context_type=PDF; filename=base64_pdf_pe_00000284.exe; kind=embedded-pe Static shellcode analysis recovered command string(s): PowerShell

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