awk -F ':' 'BEGIN{key=""} {if ($2) {key=$1}; h[key][length(h[key])+1]=$0}END{for (i in h["Subject"]) print h["Subject"][i]}' /path/to/file
00007fcd764af000 2044 — - — ----- libdigestmd5.so.2.0.23
00007fcd766ae000 4 — - — r---- libdigestmd5.so.2.0.23
00007fcd766af000 4 — - — rw--- libdigestmd5.so.2.0.23
00007fcd766b0000 36 — - — r-x-- libcrypt-2.11.1.so (deleted)
00007fcd766b9000 2048 — - — ----- libcrypt-2.11.1.so (deleted)
00007fcd768b9000 4 — - — r---- libcrypt-2.11.1.so (deleted)
00007fcd768ba000 4 — - — rw--- libcrypt-2.11.1.so (deleted)