We have found one software suitable in our database for this conversion.
Several file types that use sdr extension exist and PDF export is somewhat common for all kinds of files. Generally speaking, images and documents can be converted to PDF via virtual PDF printer. So if your .sdr file is a document or graphics, simply print it to PDF.
The most notably conversion would be export of SmartDraw drawings (.sdr) as PDF documents. This sdr to pdf conversion can be done right inside the program with the default PDF export function.
SDR
Files with sdr extension can mostly be found as drawings created using SmartDraw software that is used for making high quality presentations, charts or graphs.
PDF
A pdf file extension is mainly used for Adobe Portable document format, commonly referred to as PDF. All programs that create some sort of documents or projects offer the possibility to export their format to PDF format. A free PDF viewer (Adobe Reader) is available for download from Adobe website.