How to get a list of fields from a PDF file using VBSCRIPT?

Question

Adobe Acrobat

I have a PDF file
My code:

FileNm = "IMM0008ENU_2D.pdf" 'File location
Set gApp = CreateObject("AcroExch.app")
Set avDoc = CreateObject("AcroExch.AVDoc")
  If avDoc.Open(FileNm, "") Then
  Set PDFForm = CreateObject("AFormAut.App") 
  set x=PDFForm.Fields
  wscript.echo "total fields:",x.count
        For Each myField In x
        wscript.echo myField.Name
              Next
  End If
avDoc.Close (True) 
Set gApp = Nothing
Set avDoc = Nothing
Set PDFForm = Nothing

In the answer I receive "zero" fields.
How to get form data from this PDF file (field names, values)?