/usr/share/man/man1/pdfcslatex.1.gz is in texlive-lang-czechslovak 2017.20180305-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/pdftex.1.gz
/usr/share/man/man1/pdftex.1.gz