/usr/share/crypto++/TestData/rsa400pb.dat is in libcrypto++-utils 5.6.1-6+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | 30 4c 30 0d 06 09 2a 86
48 86 f7 0d 01 01 01 05
00 03 3b 00 30 38 02 33
00 a3 07 9a 90 df 0d fd
72 ac 09 0c cc 2a 78 b8
74 13 13 3e 40 75 9c 98
fa f8 20 4f 35 8a 0b 26
3c 67 70 e7 83 a9 3b 69
71 b7 37 79 d2 71 7b e8
34 77 cf 02 01 03
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