Here's another way to do the same thing:

$return{"objdump"} =~ s/.*?([0-9a-f]{8}|$)/$1/gs;
print "\\x$_" for $return{"objdump"} =~ /../g;
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The first line strips out every string preceding an eight-digit hex number or end of string. The second line splits the string into two-digit substrings and prints them.