There are multiple ways to create PDF samples. For example, one can create a PDF sample using Adobe InDesign. But how do you analyze it? PDF files are typically binary compressed files and unreadable. There are a number of tools that allow to investigate the content of a PDF file. But for someone who just want to convert a binary PDF file into a readable ASCII PDF we recommend pdftk - a free tool that can be downloaded from www.accesspdf.com/pdftk.