Search PDF files for Social Security Numbers

#This will search all pdf files for all 9 digit numerical matches
#this includes 9 digits together or with dashes or comas (etc).

output="ssn"
find -iname "*.pdf"| while read pdf
do
  match="$(pdftotext -layout "$pdf" - 2>/dev/null |grep '[0-9]\{3\}-\{0,1\}[0-9]\{2\}-\{0,1\}[0-9]\{4\}')"
  [[ "$match" ]] && echo "$pdf - $match"|tr -s " "
done|tee "$output"|grep '[0-9]\{3\}-\{0,1\}[0-9]\{2\}-\{0,1\}[0-9]\{4\}'
#final grep above it just for highlighting the matches

#to narrow the search to SSN formatted with dashes use this.
grep "[0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]" "$output"