/usr/src/linux-headers-4.4.0-119-lowlatency/.28901.d is in linux-headers-4.4.0-119-lowlatency 4.4.0-119.143~14.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
.28901.tmp: /dev/null