Как получить список полей из PDF файла через VBSCRIPT?

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