I have an folder full of PDFs (located at "/Users/johndoe/Desktop/xyz") and would like to move any PDF (only one file!) to another folder (located at "/Users/johndoe/Desktop/goal").
set myFile to "any file i want.pdf"
set src to "/Users/johndoe/xyz/" & myFile
set src to "/Users/johndoe/goal/" & myFile
do shell script "mv " & (quoted form of src) & " " & (quoted form of trg)