PDF malware analysis — malicious · 69a21ae0f9b44e6f

MALICIOUS

PDF

244.6 KB

MD5: d89be4316077e1fb4fdd96dfd6b2e4ce SHA-1: adb6572b119270d7f26e188b431176cdf30aea07 SHA-256: 69a21ae0f9b44e6fa609fb1646d50de956803cbbade2f0f77b4064b88fb9b4fd

92 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF file contains a heuristic firing indicating a VBScript-style decimal byte array that decodes to a PE payload. This suggests the document is a dropper, designed to extract and execute a secondary malicious executable. The embedded PE artifact, decimal_array_pdf_pe_00000229.exe, is the likely payload.

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 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` `6e9659833067a8ab1949c155905a8b37050d9e7f85ea0dba7dfc48c1941db293`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	10928 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.64, consistent with packed or encrypted content.

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