Wikipedia
PDFCreator
PDFCreator is an application for converting documents into Portable Document Format (PDF) format on Microsoft Windows operating systems. It works by creating a virtual printer that prints to PDF files, and thereby allows practically any application to create PDF files by choosing to print from within the application and then printing to the PDFCreator printer.
Since 2009, PDFCreator has included closed source adware, toolbars and other controversial software that is installed by default.