MALICIOUS
110
Risk Score
Malware Insights
MITRE ATT&CK
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The PDF file was flagged as malicious by an ML classifier and contains a VBScript-style decimal byte array that decodes to a PE executable. This indicates the document is likely a dropper designed to deliver a secondary payload. The presence of a PE payload suggests exploitation or execution of malicious code, and the document itself is likely delivered via spearphishing.
Machine Learning
- Nyx PDF Classifier malicious score 0.9956
Heuristics 2
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VBScript-style decimal byte array decodes to a PE payload critical PDF_VBS_DECIMAL_ARRAY_PE_PAYLOADPDF 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.
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Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGEOne 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 |
embedded-pe | PDF raw comment decimal-array PE payload at offset 0x229 | 31135 bytes |
SHA-256: 6bcc403b11ff3f133fb9ea2a1dafafd86c732f088974f7c6e77fc4651252bf4e |
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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 7.90, consistent with packed or encrypted content.
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