diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40273f19..0eb78482 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
-Nothing yet. 
+### Fixed
+
+- Resolving mediabox and pdffont ([#834](https://github.com/pdfminer/pdfminer.six/pull/834))
 
 ## [20231228]
 
diff --git a/pdfminer/pdffont.py b/pdfminer/pdffont.py
index 63826b96..118b9a0e 100644
--- a/pdfminer/pdffont.py
+++ b/pdfminer/pdffont.py
@@ -1001,7 +1001,7 @@ def __init__(self, rsrcmgr: "PDFResourceManager", spec: Mapping[str, Any]) -> No
             firstchar = int_value(spec.get("FirstChar", 0))
             # lastchar = int_value(spec.get('LastChar', 255))
             width_list = list_value(spec.get("Widths", [0] * 256))
-            widths = {i + firstchar: w for (i, w) in enumerate(width_list)}
+            widths = {i + firstchar: resolve1(w) for (i, w) in enumerate(width_list)}
         PDFSimpleFont.__init__(self, descriptor, widths, spec)
         if "Encoding" not in spec and "FontFile" in descriptor:
             # try to recover the missing encoding info from the font file.
diff --git a/pdfminer/pdfpage.py b/pdfminer/pdfpage.py
index 13bbb14d..b96a3cac 100644
--- a/pdfminer/pdfpage.py
+++ b/pdfminer/pdfpage.py
@@ -1,6 +1,6 @@
 import itertools
 import logging
-from typing import BinaryIO, Container, Dict, Iterator, List, Optional, Tuple
+from typing import BinaryIO, Container, Dict, Iterator, List, Optional, Tuple, Any
 
 from pdfminer.utils import Rect
 from . import settings
@@ -60,7 +60,10 @@ def __init__(
         self.resources: Dict[object, object] = resolve1(
             self.attrs.get("Resources", dict())
         )
-        self.mediabox: Rect = resolve1(self.attrs["MediaBox"])
+        mediabox_params: List[Any] = [
+            resolve1(mediabox_param) for mediabox_param in self.attrs["MediaBox"]
+        ]
+        self.mediabox: Rect = resolve1(mediabox_params)
         if "CropBox" in self.attrs:
             self.cropbox: Rect = resolve1(self.attrs["CropBox"])
         else: