KIS detected Trojan Win32.scar.a in file ...\\appdata\\local\\temp\\is.gvg9r.tmp\\pdfcreator.1.5.0.tmp during installation of PDFCreator 1.5.0.
Later, when running PDFCreator, the incidence has been repeated. I proceeded to completely uninstall the application.
did you download it from this site or from sourceforge?
If you downloaded it from somewhere else, somebody could have modified it and bundeled it with a trojan.
Some info here: