Convert PDF to PNG using C# - very noisy PNG problem

Hi! We have a problem with one PDF document.
After converting this PDF to PNG, we have very “noisy” image an output.
Noisy_PDF_to_PNG.jpg (248.9 KB)
Source file:
Attachment_5.pdf (172.5 KB)

Info:
Aspose.PDF (21.5.0)
p.s.: and this problem reproduse in online converter too. (Convert PDF | Online and Free)

@demonspe

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-51219. You will be notified via this forum thread once this issue is resolved.

We apologize for your inconvenience.