PDF malware analysis — malicious · 5f11f444c8a93d07

MALICIOUS

PDF

226.7 KB

MD5: 513dc34db2975be12f6c1960af3bc331 SHA-1: e916f2b70a0eac472d26947db069a8a83e074d59 SHA-256: 5f11f444c8a93d07ecbd7b830f1b2f553a65b9bd94a7f2f9cbce82dadf0a75d0

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 byte array that decodes to a PE payload. This suggests the document is intended to act as a dropper for a malicious executable. The embedded PE file has a SHA256 hash of d5b7febc333544e730b4583e78b15a0e617958256591b7aeeaa573b4e8380ba9. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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` `d5b7febc333544e730b4583e78b15a0e617958256591b7aeeaa573b4e8380ba9`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	32941 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.

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