PDF malware analysis — malicious · 5c44684f34336fde

MALICIOUS

PDF

244.6 KB

MD5: 4c4fb340eaf41be6156a0c40036f4ff4 SHA-1: 65bea24e17eec194033b2beca9f70fa815ec4389 SHA-256: 5c44684f34336fde5dcaf2edaabf27101940baf1c8acdb78b81998dc993a0fbf

92 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating a VBScript-style decimal byte array that decodes to a PE payload. This suggests the PDF is designed to download and execute a secondary malicious executable. The embedded PE file has a SHA256 hash of 53046e3f2acb7c981c87119efc088f85571203caf80014673d6b8460d3f8da0a.

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` `53046e3f2acb7c981c87119efc088f85571203caf80014673d6b8460d3f8da0a`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	11382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.65, consistent with packed or encrypted content.

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