Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d38f5305ef9a44e…

MALICIOUS

PDF

244.6 KB First seen: 2026-05-10
MD5: 83db41a683975b8539f2f707ba58ba34 SHA-1: bf603c38c0f1de72a6d3bd200cb85ef799c62a9f SHA-256: 1d38f5305ef9a44e2307f7a2ecc0eaba242dbe0dbceca0895661942dbb8a62c0
110 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9594

Heuristics 2

  • 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.
  • Suspicious extracted artifact medium 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.

FilenameKindSourceSize
decimal_array_pdf_pe_00000229.exe embedded-pe PDF raw comment decimal-array PE payload at offset 0x229 17163 bytes
SHA-256: 808975b914ad1e661e64824a5056a973d4e6931bd5829eb5804ff1706064b080
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=PE; declared_or_context_type=PDF; filename=decimal_array_pdf_pe_00000229.exe; kind=embedded-pe Carved artifact entropy is 7.79, consistent with packed or encrypted content.