Do you know that you can automate the creation of DWF files using VBA?
The following code listing provides an example of how to create a DWF file using VBA :

'CODING STARTS HERE
Sub test()

Dim objDoc As AutoCAD.AcadDocument
Set objDoc = Documents.Open("C:\AutoCAD 2000\sample\colorwh.dwg")
Set objPlot = objDoc.Plot
Dim blnRet As Boolean
blnRet = objPlot.PlotToFile("c:\temp\temp.dwf",
"C:\AutoCAD 2000\plotters\DWF ePlot.pc3")
'Replace C:\AutoCAD 2000 with the location of acad.exe
'blnRet should be True if the plot is successful
objDoc.Close False
End Sub
'CODING ENDS HERE