PDF malware analysis — malicious · 6ae4f6fb0d61a9fe

MALICIOUS

PDF

244.6 KB

MD5: 78040b419c137cedb41ff658a30438e1 SHA-1: 9f22a9b6975bf4996c92abe898090f53c9326280 SHA-256: 6ae4f6fb0d61a9fef20a22ef989d108d764c5b3474269816cf65c5b833ca3c49

92 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a VBScript-style decimal byte array that, when decoded, yields a PE executable payload. This strongly suggests the PDF is designed to deliver and execute a secondary malicious file. The ML classifier also flagged this PDF as malicious with high confidence.

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` `2cfc3094a5fecf5baf3d1c64fb2ce78afe6ff44664bc1e4db49dc6a46d62ea9a`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	15488 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.76, consistent with packed or encrypted content.

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