The phrase "21 Oktober 2022" is simply a date (October 21, 2022) translated into German, Dutch, or Indonesian. Thousands of different PDF documents, ranging from government decrees to academic journals and corporate financial statements, were published on that day worldwide.
Who published the PDF? (e.g., a specific government branch, a university, or a company).
Is it a newsletter, a law, an exam schedule, or a press release?
What is the document about? (e.g., an EU council resolution, a school calendar, a corporate financial report).