Try this approach
Use assign activity to prepare the destination file name and path
SourcePath = "C:\Users\YourUsername\Desktop\TIV_xxxxxx.pdf"
NewFileName = Path.GetFileNameWithoutExtension(SourcePath) + "_" + DateTime.Now.ToString("ddMMyyyy") + Path.GetExtension(SourcePath)
DestinationPath = "C:\Data\Input\" + NewFileName
Use move file activity and pass Soruce and Destination these two variables
++Made extention dynamic so it will work with any file extention.