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my $PDF = ...; # read PDF binary contents from file
my $LOGSTR = ...; # read LOG file contents
...
my $c = ... # controller
...
$c->render(json => $data); # $data as above

function ajaxit(
  url, // server endpoint
...
  // do the same for logstr
  // or, since it is text, display it in the div verbatim
}