PDF malware analysis — malicious · 790ad8f45c58dcf2

MALICIOUS

PDF

244.6 KB

MD5: 984afde2f45650a0ac84a75b70ca237a SHA-1: b41f568a80da8b2074fa03ac2a85d3a153b13ce9 SHA-256: 790ad8f45c58dcf229368d95df792d772cbbf5efd3016a9c8074612144b4b0b7

92 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing indicating a VBScript-style decimal array that decodes to a PE payload. This suggests the document is a dropper, designed to extract and execute a secondary malicious executable. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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` `f14c1455f08bf1af998ac8ea749b41e54219764c10a8efcb6ce7ba713a6e6dd5`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	29380 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.

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