diff --git a/PyPDF2/_cmap.py b/PyPDF2/_cmap.py
index 6b668d2e8..c3acb6564 100644
--- a/PyPDF2/_cmap.py
+++ b/PyPDF2/_cmap.py
@@ -182,7 +182,7 @@ def parse_to_unicode(
     cm = prepare_cm(ft)
     for l in cm.split(b"\n"):
         process_rg, process_char = process_cm_line(
-            l, process_rg, process_char, map_dict, int_entry
+            l.strip(b" "), process_rg, process_char, map_dict, int_entry
         )
 
     for a, value in map_dict.items():
diff --git a/PyPDF2/_reader.py b/PyPDF2/_reader.py
index 53b9e4392..1664bfe9d 100644
--- a/PyPDF2/_reader.py
+++ b/PyPDF2/_reader.py
@@ -1303,7 +1303,7 @@ def _basic_validation(self, stream: StreamType) -> None:
             stream.seek(0, os.SEEK_END)
 
     def _find_eof_marker(self, stream: StreamType) -> None:
-        last_mb = stream.tell() - 1024 * 1024 + 1  # offset of last MB of stream
+        last_mb = 8  # to parse whole file
         line = b""
         while line[:5] != b"%%EOF":
             if stream.tell() < last_mb:
diff --git a/tests/test_reader.py b/tests/test_reader.py
index 97365da49..cb356094f 100644
--- a/tests/test_reader.py
+++ b/tests/test_reader.py
@@ -11,11 +11,7 @@
 from PyPDF2.constants import ImageAttributes as IA
 from PyPDF2.constants import PageAttributes as PG
 from PyPDF2.constants import Ressources as RES
-from PyPDF2.errors import (
-    STREAM_TRUNCATED_PREMATURELY,
-    PdfReadError,
-    PdfReadWarning,
-)
+from PyPDF2.errors import PdfReadError, PdfReadWarning
 from PyPDF2.filters import _xobj_to_image
 from PyPDF2.generic import Destination
 
@@ -396,7 +392,9 @@ def test_read_malformed_header():
 def test_read_malformed_body():
     with pytest.raises(PdfReadError) as exc:
         PdfReader(io.BytesIO(b"%PDF-"), strict=True)
-    assert exc.value.args[0] == STREAM_TRUNCATED_PREMATURELY
+    assert (
+        exc.value.args[0] == "EOF marker not found"
+    )  # used to be:STREAM_TRUNCATED_PREMATURELY
 
 
 def test_read_prev_0_trailer():