Xpdf is a suite of tools for portable document format (pdf) files. (these are sometimes called 'acrobat' files after the name of adobe's pdf software.)
this package contains pdftops (pdf to postscript converter), pdfinfo (pdf document information extractor), pdfimages (pdf image extractor), pdftotext (pdf to text converter), and pdffonts (pdf font analyzer).
to view pdf files, see the xpdf-reader package. that package also contains pdftoppm (pdf to portable bitmap converter).