pdftopbm segfaults on valid pdf files ...
bash# pdftopbm /usr/share/texmf/doc/etex/base/etex-man.pdf bar
Segmentation fault (core dumped)
I suspect this is low priority
pdftopbm gets a bus error on sparc ultra.
sparc is no longer supported.
additionally, this works fine with the xpdf from RHL 7.0 on i386 at least.