PDF malware analysis — malicious · 761745595a24d6a8

MALICIOUS

PDF

150.9 KB

MD5: 229dadc41e17f2aac75c0c3256137ede SHA-1: 77f9bf0000a984ca64a47583f3327e2455607a64 SHA-256: 761745595a24d6a85d38f57000cdacde8b8d8d579547692647a09a4bca6b395d

92 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a VBScript-style decimal array that decodes to a PE payload, indicating it's designed to deliver an executable. The ML classifier strongly flagged this PDF as malicious. The embedded executable artifact and the heuristic firing confirm the intent to execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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` `98459f56556ca0fe82435f4b35c96a8b0be99e4f7277460095d64126eea8381b`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	21897 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.84, consistent with packed or encrypted content.

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