Malicious PDF — malware analysis report

Static analysis result for SHA-256 923b9fc10b93ff8b…

MALICIOUS

PDF

14.6 KB
MD5: 249dcfd2b3d0587d943043866c1bfe08 SHA-1: 5e7a6744c10a86085490f4fdafaa198e45fee644 SHA-256: 923b9fc10b93ff8b8498ed717548bf45d18faf46aaf97da31dbd1547a470159f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains an embedded script payload and is flagged by multiple high-confidence heuristics, including ML and ClamAV, indicating it's a dropper. The embedded script is likely responsible for downloading and executing a second-stage payload. The presence of an XFA form is also noted.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000329.bin
ef91af4f9ba4dac96989659693152325f4c37061cd2c42e70d2c2eb6eadab6d5		 pdf-embedded-script PDF raw stream script payload at offset 0x329 14191 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36809
Obfuscation or payload: unlikely

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