filter.exe output doesn't match incident

We have a incident involving a PDF matching on sensitive information, however when viewing the PDF directly none of the sensitive information is visible. We think it might be due to hidden layers. 

To verify this we've used the filter.exe located within SymantecDLP\Protect\plugins\contentextraction\Verity\x64

filter.exe incident.pdf indicent.txt

However, the output within incident.txt does not contain any of the matched incident data.

Are any additional flags required to output the data or are we missing a crucial step?