• Add a search service, with searched elements="Documents" and criterion "Documents > 'Format' criterion"
• Add a page with service "Attachments"
• Add the PDF to this page as an attachment
• It is not retrieved when selecting "PDF" (nor All)

Because the indexed field DCFormat is "application/pdf; version=1.4"

it should be "application/pdf"

According to https://fr.wikipedia.org/wiki/Type_de_m%C3%A9dias, the ";" character indicates that the next characters are optional parameters