just found
./texmf-dist/tex/latex/graphics/pdftex.def
./texmf-dist/tex/latex/pdftexdef/pdftex.def
< \ProvidesFile{pdftex.def}[2005/06/20 v0.03m graphics/color for pdftex]
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> \ProvidesFile{pdftex.def}[2002/06/19 v0.03k graphics/color for pdftex]
Regards, Hartmut