/usr/share/kdisplay/app-defaults/Xpdf.ad is in plasma-desktop-data 4:5.8.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | xpdf.urlCommand: kfmclient exec %s
xpdf.foreground: FOREGROUND
xpdf.background: BACKGROUND
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