Just upgraded PulseAudio from 9.0-1 => 10.0-2, which was no good, as I was left with no sound.
downgrade.sh libpulse pulseaudio pulseaudio-bluetooth
From now on I have to use
pacman -Syu --ignore pulseaudio --ignore libpulse --ignore pulseaudio-bluetooth
to not lose the good version and getting the infected version again.