[Zubersoft]

The only things that come to mind are sorting by date created with the newest songs at the top so you can delete recently created songs, or you can go to Settings->Backup and Restore->Restore Automatic Database Backup and just revert the entire library to the point before you imported those bad songs. You could also go to Settings->Library Settings->Song Title Formatting, include page order as one of the fields, and then delete every song that points to the start of the PDF.

Mike