diff --git a/data-prepper-plugins/dynamodb-source/src/main/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/RecordConverter.java b/data-prepper-plugins/dynamodb-source/src/main/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/RecordConverter.java
index 5c8093597f..a2043991bc 100644
--- a/data-prepper-plugins/dynamodb-source/src/main/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/RecordConverter.java
+++ b/data-prepper-plugins/dynamodb-source/src/main/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/RecordConverter.java
@@ -14,6 +14,7 @@
 import org.opensearch.dataprepper.model.record.Record;
 import org.opensearch.dataprepper.plugins.source.dynamodb.model.TableInfo;
 
+import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.Map;
 
@@ -56,7 +57,11 @@ public RecordConverter(final BufferAccumulator<Record<Event>> bufferAccumulator,
      */
     private String getAttributeValue(final Map<String, Object> data, String attributeName) {
         if (data.containsKey(attributeName)) {
-            return String.valueOf(data.get(attributeName));
+            final Object value = data.get(attributeName);
+            if (value instanceof Number) {
+                return new BigDecimal(value.toString()).toPlainString();
+            }
+            return String.valueOf(value);
         }
         return null;
     }
diff --git a/data-prepper-plugins/dynamodb-source/src/test/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/ExportRecordConverterTest.java b/data-prepper-plugins/dynamodb-source/src/test/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/ExportRecordConverterTest.java
index d996c67d8e..c2e9ed1051 100644
--- a/data-prepper-plugins/dynamodb-source/src/test/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/ExportRecordConverterTest.java
+++ b/data-prepper-plugins/dynamodb-source/src/test/java/org/opensearch/dataprepper/plugins/source/dynamodb/converter/ExportRecordConverterTest.java
@@ -10,6 +10,9 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
@@ -26,6 +29,7 @@
 import java.util.List;
 import java.util.Random;
 import java.util.UUID;
+import java.util.stream.Stream;
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.equalTo;
@@ -44,9 +48,9 @@
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.ExportRecordConverter.EXPORT_RECORDS_PROCESSED_COUNT;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.ExportRecordConverter.EXPORT_RECORDS_PROCESSING_ERROR_COUNT;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.DDB_STREAM_EVENT_NAME_METADATA_ATTRIBUTE;
-import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.EVENT_VERSION_FROM_TIMESTAMP;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.EVENT_NAME_BULK_ACTION_METADATA_ATTRIBUTE;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.EVENT_TIMESTAMP_METADATA_ATTRIBUTE;
+import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.EVENT_VERSION_FROM_TIMESTAMP;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.PARTITION_KEY_METADATA_ATTRIBUTE;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.PRIMARY_KEY_DOCUMENT_ID_METADATA_ATTRIBUTE;
 import static org.opensearch.dataprepper.plugins.source.dynamodb.converter.MetadataKeyAttributes.SORT_KEY_METADATA_ATTRIBUTE;
@@ -164,4 +168,41 @@ void test_writeSingleRecordToBuffer() throws Exception {
         verify(bytesReceivedSummary, times(1)).record(line.getBytes().length);
         verify(bytesProcessedSummary, times(1)).record(line.getBytes().length);
     }
+
+    @ParameterizedTest
+    @MethodSource("decimalFormatKeysArgumentProvider")
+    void writing_record_to_buffer_with_ion_formatted_decimals_creates_expected_partition_and_sort_key(
+            final String partitionKey,
+            final String sortKey,
+            final String expectedPartitionKey,
+            final String expectedSortKey
+    ) throws Exception {
+
+        final ArgumentCaptor<Record> recordArgumentCaptor = ArgumentCaptor.forClass(Record.class);
+        final String line = " $ion_1_0 {Item:{PK:" + partitionKey + ",SK:" + sortKey + "}}";
+
+        ExportRecordConverter objectUnderTest = new ExportRecordConverter(bufferAccumulator, tableInfo, pluginMetrics);
+        doNothing().when(bufferAccumulator).add(recordArgumentCaptor.capture());
+
+        objectUnderTest.writeToBuffer(eq(null), List.of(line));
+        verify(bufferAccumulator).add(any(Record.class));
+        verify(bufferAccumulator).flush();
+        assertThat(recordArgumentCaptor.getValue().getData(), notNullValue());
+        JacksonEvent event = (JacksonEvent) recordArgumentCaptor.getValue().getData();
+
+        assertThat(event.getMetadata(), notNullValue());
+
+        assertThat(event.getMetadata().getAttribute(PARTITION_KEY_METADATA_ATTRIBUTE), equalTo(expectedPartitionKey));
+        assertThat(event.getMetadata().getAttribute(SORT_KEY_METADATA_ATTRIBUTE), equalTo(expectedSortKey));
+        assertThat(event.getMetadata().getAttribute(PRIMARY_KEY_DOCUMENT_ID_METADATA_ATTRIBUTE), equalTo(expectedPartitionKey + "|" + expectedSortKey));
+    }
+
+    private static Stream<Arguments> decimalFormatKeysArgumentProvider() {
+        return Stream.of(
+                Arguments.of("86067d1", "39.29", "860670", "39.29"),
+                Arguments.of("212d9", "0d0", "212000000000", "0"),
+                Arguments.of("0.", "4.2d1", "0", "42"),
+                Arguments.of("0.420d2", "42d0", "42.0", "42")
+        );
+    }
 }
\ No newline at end of file