PDF malware analysis — malicious · 0a7a63e603bffb80

MALICIOUS

PDF

150.9 KB

MD5: fc076eae82f69cfaa8e3ba104450e4b0 SHA-1: a35555794c3c2eac0f8400d382359fa57d4559b0 SHA-256: 0a7a63e603bffb808fa84ba5a7269339bb6ba6872a7d0b45793986a5903b7b38

152 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics, including a critical finding of a VBScript-style decimal array that decodes to a PE payload. This indicates the PDF is designed to drop and execute a secondary malicious executable. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern observed is the use of obfuscated code within the PDF to deliver a PE file.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 3

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.
ClamAV: Pdf.Dropper.Agent-7226975-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7226975-0
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` `b3f7ae0b07c58dff850f09ab1b75c63430d3b18c88c5b1f7ac385e21bc5bd460`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	21896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.84, consistent with packed or encrypted content.

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