PDF malware analysis — malicious · 754dd25c2d06a907

MALICIOUS

PDF

244.6 KB

MD5: d2482a032a378470d36bd2893550f35b SHA-1: 1ffafa52b57cd225e027aa841ff8ab5fe79c2671 SHA-256: 754dd25c2d06a9076a76714cccbacca4d086875332e44e8320a5bd89363b4ed8

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains a critical heuristic firing indicating a VBScript-style decimal array that decodes to a PE payload. This suggests the PDF is acting as a dropper for a malicious executable. The ML classifier also strongly flagged the PDF as malicious. The extracted PE artifact has a SHA256 hash of 8f79805079df92c5d15a688dc4738c9ebf3b1db89e2bd6162cab595e00a5dd484.

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` `8f7980507df92c5d15a688dc4738c9ebf3b1db89e2bd6162cab595e00a5dd484`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x229	35180 bytes
Detection ClamAV: Win.Trojan.Agent-535339 Obfuscation or payload: likely Carved artifact entropy is 7.78, consistent with packed or encrypted content.

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