diff --git a/samples/bugs/Issue715.pdf b/samples/bugs/Issue715.pdf
index 7dc919f8..b5b1fc7b 100644
Binary files a/samples/bugs/Issue715.pdf and b/samples/bugs/Issue715.pdf differ
diff --git a/tests/PHPUnit/Integration/Element/ElementStringTest.php b/tests/PHPUnit/Integration/Element/ElementStringTest.php
index 61d3ad6b..a6e21fb4 100644
--- a/tests/PHPUnit/Integration/Element/ElementStringTest.php
+++ b/tests/PHPUnit/Integration/Element/ElementStringTest.php
@@ -131,6 +131,9 @@ public function testParse(): void
         $element = ElementString::parse('(Gutter\\ console\\ assembly)', null, $offset);
         $this->assertEquals('Gutter console assembly', $element->getContent());
         $this->assertEquals(27, $offset);
+
+        $element = ElementString::parse('(())');
+        $this->assertEquals('()', $element->getContent());
     }
 
     public function testGetContent(): void
diff --git a/tests/PHPUnit/Integration/ParserTest.php b/tests/PHPUnit/Integration/ParserTest.php
index 2e1f3aa8..b91f0aae 100644
--- a/tests/PHPUnit/Integration/ParserTest.php
+++ b/tests/PHPUnit/Integration/ParserTest.php
@@ -449,8 +449,10 @@ public function testSpecialCharsEncodedAsHex(): void
         $this->fixture = new Parser();
         $document = $this->fixture->parseFile($filename);
         $result = (string) ($document->getObjectsByType('Sig')['4_0'] ?? null)?->getHeader()->get('Contents');
-
         $this->assertEquals('()\\', $result);
+        $details = $document->getDetails();
+        $this->assertEquals('x(y)', $details['Producer'] ?? null);
+        $this->assertEquals('a(b)', $details['Creator'] ?? null);
     }
 }