Pstotext

From the packet-description:

"pstotext extracts text (in the ISO 8859-1 character set) from a PostScript or PDF (Portable Document Format) file. Thus, pstotext is similar to the ps2ascii program that comes with ghostscript. The output of pstotext is however better than that of ps2ascii, because pstotext deals better with punctuation and ligatures."

Also, take a look at this page and ps2ascii.