/usr/lib/debug/.build-id/ac/ is in libgcrypt20-dbg 1.6.3-2+deb8u4.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/ac/8843b23f3f62f5b197b4ffc536d4bacb228ef2.debug
    
 | application/x-executable | root:root | 0o644 | 19.2 KB |