Mailed PDF Documents spit out garbage

I have a MacOS app that generates PDF document and adds them to an email. About 10% turns the PDF into a stream of characters like:

–a27mcmea8awd
Content-Type: application/pdf; name=“Receipt123.pdf”; name*=utf-8’‘Receipt123.pdf
Content-transfer-encoding: Base64
Content-disposition: attachment; filename=“Receipt123.pdf”; filename*=utf-8’'Receipt123.pdf

JVBERi0xLjUKJeLjz9MKMSAwIG9iaiA8PCAvVHlwZSAvQ2F0YWxvZyAvTGFuZyAoKSAvUGFnZXMg
…

Does anyone know why this happens? No errors are reported and the PDF file is not corrupte

Thaks
Robin

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