Package: xpdf

"xpdf" package binaries on CentOS:

/usr/bin/pdfdetach /usr/bin/pdftopng /usr/bin/xpdf

You may install this package on CentOS with yum install xpdf

"xpdf" package binaries on Debian:

/usr/bin/xpdf /usr/bin/xpdf.real /usr/bin/zxpdf

You may install this package on Debian with apt-get install xpdf