PDF malware analysis — malicious · 030586a1b9ee0d67

MALICIOUS

PDF

244.6 KB

MD5: a91d57c592bbe38b48af8af483f162cb SHA-1: 3530624ffed8e55214b7d625dbb8b99d9ccafb81 SHA-256: 030586a1b9ee0d67dc4e5f833849c71c57534d066db18c17f9a8e7418b52970a

92 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a VBScript-style decimal byte array that, when decoded, yields a PE payload. This strongly suggests the document's purpose is to deliver and execute a secondary malicious executable. The ML classifier also flagged this 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` `6eaaa3c3330ade49ad75babf738576e4b0307a7780d37069e981dfa9d9dc0e9a`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	26907 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.88, consistent with packed or encrypted content.

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