Convert PDF to Word throw a IndexOutOfRangeException

I have a PDF document,I want to convert it to Word with Aspose.PDF, But throw a IndexOutOfRangeException.Please tell me how to do,thank you !
the version is Aspose.PDF for .Net 22.3.0.

the sample code :
var pdfDocument = new Aspose.Pdf.Document(@“D:\abc\1128\六年级数学期中试卷(学生版).pdf”);
pdfDocument.Save(@“D:\abc\1128\六年级数学期中试卷(学生版).docx”, SaveFormat.DocX);

the file:
六年级数学期中试卷(学生版).pdf (1.6 MB)

the stack trace:
image.png (101.8 KB)

@sullivan

We have managed to reproduce the same issue at our side. For the sake of correction, we have logged this problem in our issue tracking system as PDFNET-51558. You will be notified via this forum thread once this issue is resolved.

We apologize for your inconvenience.

The issues you have found earlier (filed as PDFNET-51558) have been fixed in Aspose.PDF for .NET 23.8.