Steps to reproduce:
Go to OCR Online. Convert PDF to Searchable PDF
Upload the following file: Doc00008.pdf Doc00008.pdf (84.5 KB)
Change recognition language to “German” and click button “Start OCR”.
Wait until recognition is finished and PDF is displayed again in the browser. Click the button “download” in the browsers PDF-Viewer to download the generated pdf-file to your harddisk.
Open the generated PDF-File from your harddisk with Adobe Acrobat Reader DC.
Adobe Reader complains about an embedded font with the name 'AAAAAA+ invisible" inside the genrated file.