pdf - Ghostscript と pdfmark を使用して pdf メタデータを更新するときの間違ったエンコード

Answer 1

The PDF Reference states that the Title entry in the document info dictionary is of type 'text string'. Text strings are defined as using either PDFDocEncoding or UTF-16BE with a Byte Order Mark (see page 158 of the 1.7 PDF Reference Manual).

So you cannot specify a Title using UTF-8 without a BOM.

I would imagine that if you replace the Title string with a string defining the content using UTF-16BE with a BOM then it will work properly. I would suggest you use a hex string rather than a regular PostScript string to specify the data, simply for ease of use.