This file is indexed.

/usr/src/openvswitch-1.4.0/lib/dh2048.pem is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEA9kJXtwh/CBdyorrWqULzBej5UxE5T7bxbrlLOCDaAadWoxTpj0BV
89AHxstDqZSt90xkhkn4DIO9ZekX1KHTUPj1WV/cdlJPPT2N286Z4VeSWc39uK50
T8X8dryDxUcwYc58yWb/Ffm7/ZFexwGq01uejaClcjrUGvC/RgBYK+X0iP1YTknb
zSC0neSRBzZrM2w4DUUdD3yIsxx8Wy2O9vPJI8BD8KVbGI2Ou1WMuF040zT9fBdX
Q6MdGGzeMyEstSr/POGxKUAYEY18hKcKctaGxAMZyAcpesqVDNmWn6vQClCbAkbT
CD1mpF1Bn5x8vYlLIhkmuquiXsNV6TILOwIBAg==
-----END DH PARAMETERS-----

These are the 2048 bit DH parameters from "Assigned Number for SKIP Protocols"
(http://www.skip-vpn.org/spec/numbers.html).
See there for how they were generated.