BUG: Title sometimes is bytes and not str.

pypdf/_doc_common.py

@@ -121,6 +121,11 @@ def _get_text(self, key: str) -> Optional[str]:
         retval = self.get(key, None)
         if isinstance(retval, TextStringObject):
             return retval
+        if isinstance(retval, ByteStringObject):
+            try:
+                return retval.decode(encoding='utf-8')
+            except UnicodeDecodeError:
+                raise PyPdfError("Unable to decode text in metadata using UTF-8.")
         return None
 
     @property

tests/test_reader.py

@@ -108,9 +108,19 @@ def test_read_metadata(pdf_path, expected):
         docinfo.modification_date
         docinfo.modification_date_raw
         if "/Title" in metadict:
+            assert isinstance(docinfo.title, str)
             assert metadict["/Title"] == docinfo.title
 
 
+def test_read_metadata_title_is_bytes():
+    with open(RESOURCE_ROOT / "bytes.pdf", "rb") as inputfile:
+        reader = PdfReader(inputfile)
+        docinfo = reader.metadata
+        metadict = dict(docinfo)
+        assert isinstance(docinfo.title, str)
+        assert docinfo.title == 'Microsoft Word - トランスバース社買収電話会議英語Final.docx'
+
+
 def test_iss1943():
     with PdfReader(RESOURCE_ROOT / "crazyones.pdf") as reader:
         docinfo = reader.metadata