diff --git a/modules/dasBidAdapter.js b/modules/dasBidAdapter.js
index 53b0ee92033..81f31be99c8 100644
--- a/modules/dasBidAdapter.js
+++ b/modules/dasBidAdapter.js
@@ -248,11 +248,14 @@ function buildOpenRTBRequest(bidRequests, bidderRequest) {
     request.ext.adbeta = customParams.adbeta;
   }
 
-  // AdShield anti-adblock recovery signal (set by dlApi as customParams.asd, like adbeta).
-  // Sent as a plain ext field (not a key-value) so das-bidder serves only
-  // adblock-compatible demand (adblock_compability == 2).
-  if (customParams.asd) {
-    request.ext.asd = customParams.asd;
+  const adf = parseInt(customParams.adf, 10);
+  if (Number.isInteger(adf) && adf > 0) {
+    request.ext.adf = adf;
+  }
+
+  const asd = parseInt(customParams.asd, 10);
+  if (Number.isInteger(asd) && asd > 0) {
+    request.ext.asd = asd;
   }
 
   if (bidderRequest.device) {
diff --git a/test/spec/modules/dasBidAdapter_spec.js b/test/spec/modules/dasBidAdapter_spec.js
index d8252171945..a18a2a3b9cb 100644
--- a/test/spec/modules/dasBidAdapter_spec.js
+++ b/test/spec/modules/dasBidAdapter_spec.js
@@ -179,7 +179,7 @@ describe('dasBidAdapter', function () {
       expect(payload.imp[0].banner.format[0]).to.deep.equal({ w: 300, h: 250 });
     });
 
-    it('should route customParams.asd into ext.asd for AdShield recovery', function () {
+    it('should route customParams.asd into ext.asd as an integer', function () {
       const asdBidRequests = [{
         ...bidRequests[0],
         params: {
@@ -204,6 +204,66 @@ describe('dasBidAdapter', function () {
       expect(payload.ext.asd).to.be.undefined;
     });
 
+    it('should route customParams.adf into ext.adf as an integer', function () {
+      const adfBidRequests = [{
+        ...bidRequests[0],
+        params: {
+          ...bidRequests[0].params,
+          customParams: { adf: 1 }
+        }
+      }];
+
+      const request = spec.buildRequests(adfBidRequests, bidderRequest);
+      const params = new URLSearchParams(request.url.split('?')[1]);
+      const payload = JSON.parse(decodeURIComponent(params.get('data')));
+
+      expect(payload.ext.adf).to.equal(1);
+      expect(payload.ext.asd).to.be.undefined;
+      expect(payload.ext.keyvalues.adf).to.be.undefined;
+    });
+
+    it('should not set ext.adf without customParams.adf', function () {
+      const request = spec.buildRequests(bidRequests, bidderRequest);
+      const params = new URLSearchParams(request.url.split('?')[1]);
+      const payload = JSON.parse(decodeURIComponent(params.get('data')));
+
+      expect(payload.ext.adf).to.be.undefined;
+    });
+
+    it('should coerce string customParams.adf and customParams.asd to integers', function () {
+      const stringBidRequests = [{
+        ...bidRequests[0],
+        params: {
+          ...bidRequests[0].params,
+          customParams: { adf: '1', asd: '1' }
+        }
+      }];
+
+      const request = spec.buildRequests(stringBidRequests, bidderRequest);
+      const params = new URLSearchParams(request.url.split('?')[1]);
+      const payload = JSON.parse(decodeURIComponent(params.get('data')));
+
+      expect(payload.ext.adf).to.equal(1);
+      expect(payload.ext.asd).to.equal(1);
+    });
+
+    it('should drop non-numeric or zero customParams.adf and customParams.asd', function () {
+      const badBidRequests = [{
+        ...bidRequests[0],
+        params: {
+          ...bidRequests[0].params,
+          customParams: { adf: 'yes', asd: 0 }
+        }
+      }];
+
+      const request = spec.buildRequests(badBidRequests, bidderRequest);
+      const params = new URLSearchParams(request.url.split('?')[1]);
+      const payload = JSON.parse(decodeURIComponent(params.get('data')));
+
+      expect(payload.ext.adf).to.be.undefined;
+      expect(payload.ext.asd).to.be.undefined;
+    });
+
     it('should use GET method when URL is under 8192 characters', function () {
       const request = spec.buildRequests(bidRequests, bidderRequest);
       expect(request.method).to.equal('GET');