Problem with iTextSharp - Text in wrong direction

I want to read a value from a specific area of a PDF file.

text to be read, reading area marked in red

For this, I have defined an area in the PDF that should be read.

MyCode:

Dim pageNumber As Integer = 1
Dim rect = New iTextSharp.text.Rectangle(408, 648, 570, 665)
Dim filters As RenderFilter() = {New RegionTextRenderFilter(rect)}
Dim strategy As ITextExtractionStrategy = New FilteredTextRenderListener(
    New LocationTextExtractionStrategy(), filters)
extractedText = PdfTextExtractor.GetTextFromPage(reader, pageNumber, strategy)

However, when I read the area with my code, I receive the following result: extractedText = ". : r N g - a r t u f A 0 3 7 4 0 2 3 2"

What am I doing wrong?

Thank you for your suggestions!

Sven

Dim pageNumber As Integer = 1
Dim rect = New iTextSharp.text.Rectangle(408, 648, 570, 665)
Dim filters As RenderFilter() = {New RegionTextRenderFilter(rect)}
Dim strategy As ITextExtractionStrategy = New FilteredTextRenderListener(
    New LocationTextExtractionStrategy(), filters)
extractedText = PdfTextExtractor.GetTextFromPage(reader, pageNumber, strategy)