It is a known issue that the Evince Document Viewer does not support subpixel rendering.
Do a Google search for
evince subpixel rendering.
Well, actually the problem is not that patches are not good enough, the problem is that it's not possible to enable subpixel-hinted rendering without breaking transparencies. For subpixel-hinted rendering to work we would need to first fill the surface in white and then call poppler_page_render to render the page, but PDF blend modes need an initially transparent surface to work. We consider blend modes more important than subpixel-hinted rendering of fonts.
There are patches to use to enable subpixel rendering. It is possible to apply them, even if you are not a programmer.
In any case, subscribe to the bug report at https://bugs.launchpad.net/poppler/+bug/80921