help with windows vbscript code

I have written a small script that copies a file (or number of files) from a folder to two different locations and then deletes the original. The problem is that it works fine when I hardcode in the actual filename, but it will not work when I try to use a wildcard filename (e.g. "*.pdf"). I need to use the wildcard because at runtime, I will not know the filename because they are randomly generated. Any ideas??

---

' VBScript.
Dim FSO
Set FSO = CreateObject("Scripting.FileSystemObject")

' make sure the files exist before copying them
if FSO.FileExists("*.pdf") then
FSO.CopyFile "*.pdf", "FolderA"
FSO.CopyFile "*.pdf", "FolderB"
end if

' make sure the files exist before deleting them
if FSO.FileExists("*.pdf") then
FSO.DeleteFile "*.pdf"
end if

' destroy object
set FSO = nothing

---

If I substitute an actual filename (e.g. "Sample1.pdf") for ("*.pdf") in the above code, it works fine.